<?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>S0185-11012018000200325</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Variable stars in NGC 4147 revisited: RR Lirae stars new CCD VI photometry and physical parameters]]></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[Rojas Galindo]]></surname>
<given-names><![CDATA[F. C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muneer]]></surname>
<given-names><![CDATA[S.]]></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[,Universidad de Antioquia Instituto de Física ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</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>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>54</volume>
<numero>2</numero>
<fpage>325</fpage>
<lpage>339</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012018000200325&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012018000200325&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012018000200325&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We have calculated the physical parameters of the RR Lyrae stars in the globular cluster NGC 4147 via the Fourier decomposition of their light curves, using new data and well-established semi-empirical calibrations and zero points. The mean metallicity and distance estimated using the RRc stars are [Fe/H]ZW =&#8722;1.72 ± 0.15 and 19.05 ± 0.46 kpc, respectively. The star V18, whose variability has been previously in dispute, is confirmed to be a variable of the SR type with a period of about 24.8d, and it has been used to get an independent distance estimate of the cluster. It is observed that the RRab and RRc stars do not share the inter-mode region in the horizontal branch. The cluster can be classified as of intermediate Oosterhoff type. Its horizontal branch structure and metallicity make a good case for extragalactic origin. It follows the distribution of Oo I type globular clusters in the MV &#8722;[Fe/H] plane, as depicted from the RRc stars.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los parámetros físicos de las estrellas RR Lyrae en NGC 4147 se calcularon por medio de la descomposición de Fourier de sus curvas de luz, empleando calibraciones y puntos cero bien establecidos. Las estrellas RRc indican valores medios para la metalicidad y distancia al cúmulo de [Fe/H]ZW = &#8722;1.72 ± 0.15 and 19.05 ± 0.46 kpc, respectivamente. La estrella V18, cuya variabilidad había sido puesta en duda, se confirma ahora como una variable del tipo SR con un periodo de 24.8d y pudo ser empleada para estimar la distancia al cúmulo de manera independiente. Se observa que las estrellas RRab y RRc comparten la zona inter-modo en la zona de inestabilidad. El cúmulo puede clasificarse como del tipo intermedio de Oosterhoff. La estructura de su rama horizontal y su metalicidad favorecen la interpretación de su origen extragaláctico. En el plano MV &#8722;[Fe/H] el cúmulo sigue la tendencia de los cúmulos tipo Oo I, definida por sus estrellas tipo RRc.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[globular clusters: individual: NGC 4147]]></kwd>
<kwd lng="en"><![CDATA[stars: variables: RR Lyrae]]></kwd>
</kwd-group>
</article-meta>
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