<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0185-1101</journal-id>
<journal-title><![CDATA[Revista mexicana de astronomía y astrofísica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. astron. astrofis]]></abbrev-journal-title>
<issn>0185-1101</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Astronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-11012017000100121</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[CCD Time-Series Photometry of variable stars in globular clusters and the metallicity dependence of the horizontal branch luminosity]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[Sunetra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Qatar Foundation Qatar Environment and Energy Research Institute (QEERI) ]]></institution>
<addr-line><![CDATA[Doha ]]></addr-line>
<country>Qatar</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Indian Institute of Astrophysics  ]]></institution>
<addr-line><![CDATA[Bangalore ]]></addr-line>
<country>India</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>53</volume>
<numero>1</numero>
<fpage>121</fpage>
<lpage>131</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012017000100121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000100121&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000100121&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Describimos y hacemos un resumen del programa de fotometría en series temporales CCD de cúmulos globulares y el empleo de la técnica de análisis de imágenes diferenciales (DIA) en la extracción de curvas de luz de gran precisión, incluso en las regiones centrales super pobladas y para estrellas más brillantes que V  &#8776; 19 mag. Esta estrategia nos ha permitido descubrir aproximadamente 250 variables en una familia de 23 cúmulos seleccionados y actualizar, y en algunos casos completar, el censo de estrellas variables en cada sistema hasta cierta magnitud límite. La metalicidad y luminosidad de las variables RR Lyrae individuales se determina por la descomposición de Fourier de sus curvas de luz. En promedio esto nos conduce a la metalicidad y la distancia del cúmulo que las contiene. La familia de estrellas SX Phe nos ha permitido calcular su relación P-L y determinar de manera independiente la distancia al cúmulo. Presentamos los valores medios de [Fe/H],MV y distancia para un grupo seleccionado decúmulos globulares,obtenidos exclusivamente a partir de la descomposición de Fourier de las curvas de luz de estrellas RR Lyrae y llevados a una escala homogénea sin precedentes. Discutimos la dependencia de la luminsodidad de la Rama Horizontal a través de la relación MV -[Fe/H] y encontramos que la relación debe ser tratada por separado para las estrellas RRab y RRc.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We describe and summarize the findings from our CCD time-series photometry of globular clusters (GCs) program and the use of difference image analysis (DIA) in the extraction of very precise light curves even in the crowded central regions down to V  &#8776; 19 mag. We have discovered approximately 250 variable stars in a sample of 23 selected GCs and have, therefore, updated the census of variables in each system and in some cases we have actually completed it down to a certain magnitude. The absolute magnitude and [Fe/H] for each individual RR Lyrae is obtained via the Fourier decomposition of the light curve. An average of these parameters leads to the distance and metallicity of the host GCs. We have also calibrated the P-L relation for SX Phe stars which enables an independent calculation of the cluster distance. We present the mean [Fe/H], MV and distance for a group of selected GCs based exclusively on the RR Lyrae light curve Fourier decomposition technique and set on a rather unprecedented homogeneous scale. We also discuss the luminosity dependence of the horizontal branch (HB) via the MV -[Fe/H] relation. We find that this relation should be considered separately for the RRab and RRc stars.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[globular clusters: general - stars: abundances - stars: fundamental parameters - stars: variables: RR Lyrae]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Alard]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Lupton]]></surname>
<given-names><![CDATA[R. H.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1998</year>
<volume>503</volume>
<page-range>325</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Ahumada]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Calderón]]></surname>
<given-names><![CDATA[J. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Kains]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2014</year>
<volume>50</volume>
<page-range>307</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Arévalo]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Lázaro]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Rey]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2004</year>
<volume>40</volume>
<page-range>209</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2013</year>
<volume>434</volume>
<page-range>1220</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Kuppuswamy]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2012</year>
<volume>420</volume>
<page-range>1333</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Luna]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Muneer]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[IBVS]]></source>
<year>2015</year>
<volume>6137</volume>
<numero>1</numero>
<issue>1</issue>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[AcA]]></source>
<year>2013</year>
<volume>63</volume>
<page-range>429</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[Sunetra]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2011</year>
<volume>416</volume>
<page-range>2265</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[García Lugo]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Rosenzweig]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2006</year>
<volume>42</volume>
<page-range>75</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2010</year>
<volume>402</volume>
<page-range>226</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Yepez]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[]]></source>
<year>2017</year>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas López]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2008</year>
<volume>44</volume>
<page-range>365</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Luna]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ap&amp;SS]]></source>
<year>2016</year>
<volume>361</volume>
<page-range>175</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Mancera Piña]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2015</year>
<volume>452</volume>
<page-range>727</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas López]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2008</year>
<volume>388</volume>
<page-range>1444</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Baade]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[PASP]]></source>
<year>1946</year>
<volume>58</volume>
<page-range>249</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2008</year>
<volume>386</volume>
<page-range>L77</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes R.]]></surname>
<given-names><![CDATA[Giridhar S.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2012</year>
<volume>424</volume>
<page-range>2722</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Horne]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Albrow]]></surname>
<given-names><![CDATA[M. D.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2013</year>
<volume>428</volume>
<page-range>2275</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2011</year>
<volume>413</volume>
<page-range>1275</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cacciari]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Clementini]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Alloin]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Gieren]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[Stellar Candles for Extragalactic Distance Scale]]></source>
<year>2003</year>
<page-range>105</page-range><publisher-loc><![CDATA[Berlin ]]></publisher-loc>
<publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cacciari]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Corwin]]></surname>
<given-names><![CDATA[T. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Carney]]></surname>
<given-names><![CDATA[B. W.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2005</year>
<volume>129</volume>
<page-range>267</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caputo]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Castellani]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Marconi]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ripepi]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2000</year>
<volume>316</volume>
<page-range>819</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Carney]]></surname>
<given-names><![CDATA[B. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Strorm]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Trammell]]></surname>
<given-names><![CDATA[S. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[R. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[PASP]]></source>
<year>1992</year>
<volume>104</volume>
<page-range>44</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cassisi]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Castellani]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Degl&#8217;InnocentiO]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Salaris]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Weiss]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;AS]]></source>
<year>1999</year>
<volume>134</volume>
<page-range>103</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Catelan]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ap&amp;SS]]></source>
<year>2009</year>
<volume>320</volume>
<page-range>261</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chaboyer]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Heck]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Caputo]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Post-Hipparcos cosmic candles]]></source>
<year>1999</year>
<volume>237</volume>
<page-range>111</page-range><publisher-loc><![CDATA[Dordrecht ]]></publisher-loc>
<publisher-name><![CDATA[Kluwer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Clement]]></surname>
<given-names><![CDATA[C. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Muzzin]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Dufton]]></surname>
<given-names><![CDATA[Q.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2001</year>
<volume>122</volume>
<page-range>2587</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Clement]]></surname>
<given-names><![CDATA[C. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Shelton]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1997</year>
<volume>113</volume>
<page-range>1711</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Clementini]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Gratton]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Bragaglia]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2003</year>
<volume>125</volume>
<page-range>1309</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cohen]]></surname>
<given-names><![CDATA[R. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Sarajedini]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2012</year>
<volume>419</volume>
<page-range>342</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Kuppuswamy]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2013</year>
<volume>556</volume>
<page-range>A20</page-range></nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gratton]]></surname>
<given-names><![CDATA[R. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Bragaglia]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Carretta]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2003</year>
<volume>408</volume>
<page-range>529</page-range></nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harris]]></surname>
<given-names><![CDATA[W. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1996</year>
<volume>112</volume>
<page-range>1487</page-range></nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jurcsik]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[AcA]]></source>
<year>1995</year>
<volume>45</volume>
<page-range>653</page-range></nlm-citation>
</ref>
<ref id="B36">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jurcsik]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Kovács]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>1996</year>
<volume>312</volume>
<page-range>111</page-range></nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kains]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2015</year>
<volume>578</volume>
<page-range>A128</page-range></nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kains]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2013</year>
<volume>555</volume>
<page-range>A36</page-range></nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kains]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2012</year>
<volume>548</volume>
<page-range>A92</page-range></nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kazarovets]]></surname>
<given-names><![CDATA[E. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Samus&#8217;]]></surname>
<given-names><![CDATA[N. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Durlevich]]></surname>
<given-names><![CDATA[O. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[ARep]]></source>
<year>2009</year>
<volume>53</volume>
<page-range>1013</page-range></nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kovács]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[MmSAI]]></source>
<year>1998</year>
<volume>69</volume>
<page-range>49</page-range></nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kovács]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Walker]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2001</year>
<volume>371</volume>
<page-range>579</page-range></nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Landolt]]></surname>
<given-names><![CDATA[A. U.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1992</year>
<volume>104</volume>
<page-range>340</page-range></nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lázaro]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Arévalo]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2006</year>
<volume>372</volume>
<page-range>69</page-range></nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[Y. -W.]]></given-names>
</name>
<name>
<surname><![CDATA[Demarque]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Zinn]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1990</year>
<volume>350</volume>
<page-range>155</page-range></nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Marín]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
</person-group>
<source><![CDATA[]]></source>
<year>2002</year>
<publisher-loc><![CDATA[Mérida, Venezuela ]]></publisher-loc>
<publisher-name><![CDATA[Universidad de Los Andes]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B47">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Morgan]]></surname>
<given-names><![CDATA[S. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Wahl]]></surname>
<given-names><![CDATA[J. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Wieckhorst]]></surname>
<given-names><![CDATA[R. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2007</year>
<volume>374</volume>
<page-range>1421</page-range></nlm-citation>
</ref>
<ref id="B48">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nemec]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2004</year>
<volume>127</volume>
<page-range>2185</page-range></nlm-citation>
</ref>
<ref id="B49">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Oosterhoff]]></surname>
<given-names><![CDATA[P. Th.]]></given-names>
</name>
</person-group>
<source><![CDATA[Observatory]]></source>
<year>1939</year>
<volume>62</volume>
<page-range>104</page-range></nlm-citation>
</ref>
<ref id="B50">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Oosterhoff]]></surname>
<given-names><![CDATA[P. Th.]]></given-names>
</name>
</person-group>
<source><![CDATA[BAN]]></source>
<year>1944</year>
<volume>10</volume>
<page-range>55</page-range></nlm-citation>
</ref>
<ref id="B51">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pritzl]]></surname>
<given-names><![CDATA[B. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[H. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Catelan]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sweigart]]></surname>
<given-names><![CDATA[A. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2000</year>
<volume>530</volume>
<page-range>L41</page-range></nlm-citation>
</ref>
<ref id="B52">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pritzl]]></surname>
<given-names><![CDATA[B. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[H. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Catelan]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sweigart]]></surname>
<given-names><![CDATA[A. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2002</year>
<volume>122</volume>
<page-range>2600</page-range></nlm-citation>
</ref>
<ref id="B53">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pritzl]]></surname>
<given-names><![CDATA[B. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[H. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Catelan]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Sweigart]]></surname>
<given-names><![CDATA[A. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2002</year>
<volume>124</volume>
<page-range>949</page-range></nlm-citation>
</ref>
<ref id="B54">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Samus]]></surname>
<given-names><![CDATA[N. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Kazarovets]]></surname>
<given-names><![CDATA[E. V.]]></given-names>
</name>
<name>
<surname><![CDATA[Pastukhova]]></surname>
<given-names><![CDATA[E. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Tsvetkova]]></surname>
<given-names><![CDATA[T. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Durlevich]]></surname>
<given-names><![CDATA[O. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[PASP]]></source>
<year>2009</year>
<volume>121</volume>
<page-range>1378</page-range></nlm-citation>
</ref>
<ref id="B55">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sandage]]></surname>
<given-names><![CDATA[A.R.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1981</year>
<volume>244</volume>
<page-range>L23</page-range></nlm-citation>
</ref>
<ref id="B56">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sandage]]></surname>
<given-names><![CDATA[A.R.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1981</year>
<volume>248</volume>
<page-range>161</page-range></nlm-citation>
</ref>
<ref id="B57">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sandage]]></surname>
<given-names><![CDATA[A.R.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1993</year>
<volume>106</volume>
<page-range>703</page-range></nlm-citation>
</ref>
<ref id="B58">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sandage]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Tammann]]></surname>
<given-names><![CDATA[G. A.]]></given-names>
</name>
</person-group>
<source><![CDATA[ARA&amp;A]]></source>
<year>2006</year>
<volume>44</volume>
<page-range>93</page-range></nlm-citation>
</ref>
<ref id="B59">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shapley]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[PNAS]]></source>
<year>1917</year>
<volume>3</volume>
<page-range>479</page-range></nlm-citation>
</ref>
<ref id="B60">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shapley]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1918</year>
<volume>48</volume>
<page-range>154</page-range></nlm-citation>
</ref>
<ref id="B61">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Shapley]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[PNAS]]></source>
<year>1939</year>
<volume>25</volume>
<page-range>113</page-range></nlm-citation>
</ref>
<ref id="B62">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Schwarzenberg-Czerny]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaluzny]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>1998</year>
<volume>300</volume>
<page-range>251</page-range></nlm-citation>
</ref>
<ref id="B63">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Skottfelt]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2015</year>
<volume>573</volume>
<page-range>103</page-range></nlm-citation>
</ref>
<ref id="B64">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Skottfelt]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera Jaimes]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2013</year>
<volume>558</volume>
<page-range>111</page-range></nlm-citation>
</ref>
<ref id="B65">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stetson]]></surname>
<given-names><![CDATA[P. B.]]></given-names>
</name>
</person-group>
<source><![CDATA[PASP]]></source>
<year>2000</year>
<volume>112</volume>
<page-range>925</page-range></nlm-citation>
</ref>
<ref id="B66">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tsapras]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Arellano Ferro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>2017</year>
<volume>465</volume>
<page-range>2489</page-range></nlm-citation>
</ref>
<ref id="B67">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vanden Berg]]></surname>
<given-names><![CDATA[D. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Swenson]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Rogers]]></surname>
<given-names><![CDATA[F. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Iglesias]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Alexander]]></surname>
<given-names><![CDATA[D. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>2000</year>
<volume>532</volume>
<page-range>430</page-range></nlm-citation>
</ref>
<ref id="B68">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Walker]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1992</year>
<volume>390</volume>
<page-range>L81</page-range></nlm-citation>
</ref>
<ref id="B69">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Walker]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1998</year>
<volume>116</volume>
<page-range>220</page-range></nlm-citation>
</ref>
<ref id="B70">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zinn]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[West]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJS]]></source>
<year>1984</year>
<volume>55</volume>
<page-range>45</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
