<?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>S0185-11012016000200297</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[CCD photometry of the globular cluster NGC 6093]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruelas-Mayorga]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[L. J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bernal-Herrera]]></surname>
<given-names><![CDATA[C. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nigoche-Netro]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Echevarría]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garcia]]></surname>
<given-names><![CDATA[A. M.]]></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[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara Instituto de Astronomía y Meteorología ]]></institution>
<addr-line><![CDATA[Guadalajara ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>52</volume>
<numero>2</numero>
<fpage>297</fpage>
<lpage>309</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012016000200297&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012016000200297&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012016000200297&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: In this paper we present photometric CCD observations of the globular cluster NGC 6093 (M80) in filters B, V, R and I. We produce the colour-magnitude diagrams for this object and obtain values for its metallicity [Fe/H], reddening E(V - B), E(V - I) and distance modulus (m - M)0.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En este artículo presentamos observaciones fotométricas del cúmulo globular NGC 6093 (M80) en los filtros B, V, R e I. Producimos los diagramas color-magnitud para este objeto y obtenemos los valores de su metalicidad [Fe/H], enrojecimiento E(V - B), E(V - I), y módulo de distancia (m - M)0.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Galaxy: globular clusters]]></kwd>
<kwd lng="en"><![CDATA[techniques: photometry]]></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[Alcaino]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1998</year>
<volume>116</volume>
</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[Giridhar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Rojas Lopez]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Figuera]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Bramich]]></surname>
<given-names><![CDATA[D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Rosenzweig]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2008</year>
<volume>44</volume>
</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[Rojas Lopez]]></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>384</volume>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Benedict]]></surname>
<given-names><![CDATA[G.F.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>2002</year>
<volume>123</volume>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bica]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Pastoriza]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ap&amp;SS]]></source>
<year>1983</year>
<volume>91</volume>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Binney]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Merrifield]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Galactic Astronomy]]></source>
<year>1998</year>
<publisher-loc><![CDATA[Princeton, NJ ]]></publisher-loc>
<publisher-name><![CDATA[PUP]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brocato]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
</person-group>
<source><![CDATA[AA]]></source>
<year>1998</year>
<volume>335</volume>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Brodie]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Hanes]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1986</year>
<volume>300</volume>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Buonanno]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Corsi]]></surname>
<given-names><![CDATA[C. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Fusi Pecci]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>1985</year>
<volume>145</volume>
</nlm-citation>
</ref>
<ref id="B10">
<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[LNP 635, Stellar Candles for Extragalactric Distance Scale]]></source>
<year>2003</year>
<publisher-loc><![CDATA[Berlin ]]></publisher-loc>
<publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chaboyer]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Post-Hipparcos Cosmic Candles]]></source>
<year>1999</year>
<publisher-loc><![CDATA[Dordrech; Boston ]]></publisher-loc>
<publisher-name><![CDATA[Kluwer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Christy]]></surname>
<given-names><![CDATA[R. V.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1966</year>
<volume>144</volume>
</nlm-citation>
</ref>
<ref id="B13">
<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>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Dean]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>1978</year>
<volume>183</volume>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Demarque]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[McClure]]></surname>
<given-names><![CDATA[R. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Tinsley]]></surname>
<given-names><![CDATA[B. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Larson]]></surname>
<given-names><![CDATA[R. B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Evolution of Galaxies and Stellar Populations]]></source>
<year>1977</year>
<publisher-loc><![CDATA[New Heaven ]]></publisher-loc>
<publisher-name><![CDATA[Yale University Observatory]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fernley]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[AA]]></source>
<year>1993</year>
<volume>268</volume>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fernley]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Lynas-Gray]]></surname>
<given-names><![CDATA[A. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Skillen]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Jameson]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Marang]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>1989</year>
<volume>236</volume>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fernley]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Skillen]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Jameson]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Longmore]]></surname>
<given-names><![CDATA[A. J]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>1990</year>
<volume>242</volume>
</nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fernley]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Skillen]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Jameson]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Barnes]]></surname>
<given-names><![CDATA[T. G.]]></given-names>
</name>
<name>
<surname><![CDATA[Kilkenny]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Hill]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>1990</year>
<volume>247</volume>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ferraro]]></surname>
<given-names><![CDATA[F. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Messineo]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Fusi Pecci]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1999</year>
<volume>118</volume>
</nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ferraro]]></surname>
<given-names><![CDATA[F. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Paltrinieri]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Rood]]></surname>
<given-names><![CDATA[R. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Dorman]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1999</year>
<volume>522</volume>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harris]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1996</year>
<volume>112</volume>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harris]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<source><![CDATA[]]></source>
<year>2010</year>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harris]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Racine]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1974</year>
<volume>79</volume>
</nlm-citation>
</ref>
<ref id="B25">
<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>
</nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[McNamara]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[PASP]]></source>
<year>1997</year>
<volume>109</volume>
</nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mihalas]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Binney]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Galactic Astronomy: Structure and Kinematics]]></source>
<year>1981</year>
<edition>2</edition>
<publisher-loc><![CDATA[San Francisco: CA ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Monella]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Gli ammassi globulari: II. Coel]]></source>
<year>1985</year>
<volume>53</volume>
</nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Piotto]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[King]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Djorgovski]]></surname>
<given-names><![CDATA[S. G.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>2002</year>
<volume>391</volume>
</nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Racine]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1973</year>
<volume>78</volume>
</nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reed]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<source><![CDATA[PASP]]></source>
<year>1988</year>
<volume>100</volume>
</nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reid]]></surname>
<given-names><![CDATA[I. N.]]></given-names>
</name>
</person-group>
<source><![CDATA[ARA&amp;A]]></source>
<year>1999</year>
<volume>37</volume>
</nlm-citation>
</ref>
<ref id="B33">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rosenberg]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Piotto]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Saviane]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Aparicio]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;AS]]></source>
<year>2000</year>
<volume>144</volume>
</nlm-citation>
</ref>
<ref id="B34">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ruelas-Mayorga]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[RMxAA]]></source>
<year>2010</year>
<volume>46</volume>
</nlm-citation>
</ref>
<ref id="B35">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Saio]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ap&amp;SS]]></source>
<year>1977</year>
<volume>50</volume>
</nlm-citation>
</ref>
<ref id="B36">
<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>
</nlm-citation>
</ref>
<ref id="B37">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sarajedini]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1994</year>
<volume>107</volume>
</nlm-citation>
</ref>
<ref id="B38">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sarajedini]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Layden]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[AJ]]></source>
<year>1997</year>
<volume>113</volume>
</nlm-citation>
</ref>
<ref id="B39">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Skillen]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Fernley]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Jameson]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
<name>
<surname><![CDATA[Lynas-Gray]]></surname>
<given-names><![CDATA[A. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Longmore]]></surname>
<given-names><![CDATA[A. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>1989</year>
<volume>241</volume>
</nlm-citation>
</ref>
<ref id="B40">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Skillen]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Fernley]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<name>
<surname><![CDATA[Stobie]]></surname>
<given-names><![CDATA[R. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Jameson]]></surname>
<given-names><![CDATA[R. F.]]></given-names>
</name>
</person-group>
<source><![CDATA[MNRAS]]></source>
<year>1993</year>
<volume>265</volume>
</nlm-citation>
</ref>
<ref id="B41">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<source><![CDATA[A&amp;A]]></source>
<year>1988</year>
<volume>198</volume>
</nlm-citation>
</ref>
<ref id="B42">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Stetson]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[JRASC]]></source>
<year>1992</year>
<volume>86</volume>
</nlm-citation>
</ref>
<ref id="B43">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Suntzeff]]></surname>
<given-names><![CDATA[N. B.]]></given-names>
</name>
<name>
<surname><![CDATA[Kinman]]></surname>
<given-names><![CDATA[T. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Kraft]]></surname>
<given-names><![CDATA[R. P.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1991</year>
<volume>367</volume>
</nlm-citation>
</ref>
<ref id="B44">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Tsujimoto]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Miyamoto]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Yoshii]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1998</year>
<volume>492</volume>
</nlm-citation>
</ref>
<ref id="B45">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wan]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Mao]]></surname>
<given-names><![CDATA[Y. Q.]]></given-names>
</name>
<name>
<surname><![CDATA[Ji]]></surname>
<given-names><![CDATA[D. S.]]></given-names>
</name>
</person-group>
<source><![CDATA[AnShO]]></source>
<year>1980</year>
<volume>2</volume>
</nlm-citation>
</ref>
<ref id="B46">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Zinn]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[ApJ]]></source>
<year>1985</year>
<volume>293</volume>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
