<?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>S0185-11012024000200381</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2024.60.02.16</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The variable stars population of the extended young globular cluster NGC 1851]]></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[Pérez Parra]]></surname>
<given-names><![CDATA[C. E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yepez]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bustos Fierro]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prudil]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zerpa Guillen]]></surname>
<given-names><![CDATA[L. J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</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 Los Andes Facultad de Ciencias Dpto. Física]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Fundación Centro de Investigaciones de Astronomía Francisco, J. Duarte  ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Astrofísica, Óptica y Electrónica  ]]></institution>
<addr-line><![CDATA[Tonantzintla Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Consejo Nacional de Humanidades, Ciencias y Tecnologías  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Nacional de Córdoba Observatorio Astronómico ]]></institution>
<addr-line><![CDATA[Córdoba ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,European Southern Observatory  ]]></institution>
<addr-line><![CDATA[Garching ]]></addr-line>
<country>Germany</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>60</volume>
<numero>2</numero>
<fpage>381</fpage>
<lpage>396</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012024000200381&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012024000200381&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012024000200381&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We report VI CCD photometry of the globular cluster NGC 1851. We aim to study the membership of the variable stars detected in the field of the cluster as listed in the Catalogue of Variable stars in Globular Clusters (CVSGC; Clement et al. 2001) and reported by the Gaia mission. We cross match the two sets of variables to produce light curves that lead to the estimation of physical parameters. The resulting colour-magnitude diagram (CMD), free of likely field stars, enables us to confirm from the position of the variables their type and evolutionary stage. We provide new estimations of the period using data acquired on a long time-base. The Fourier decomposition of cluster member RR Lyrae light curves lead to a mean metallicity and distance of [Fe/H]ZW = &#8722;1.35 ± 0.22 dex and 11.9 ± 0.6 kpc. The variability and membership of stars reported by Gaia-DR3 as variables in the field of the cluster is discussed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Reportamos fotometría VI del cúmulo globular NGC 1851. La finalidad es hacer un análisis de membresía de las variables detectadas en el campo del cúmulo y reportadas en el Catalogue of Variable stars in Globular Clusters (CVSGC, Clement et al. 2001) y por la misión Gaia. Los dos conjuntos de datos permitieron la producción de curvas de luz y la estimación de parámetros físicos estelares. El diagrama color-magnitud resultante, sin estrellas de campo, permite confirmar el tipo de cada estrella variable y su estado evolutivo. Reportamos nuevas estimaciones de los periodos de pulsación. La descomposición de Fourier de las curvas de luz de estrellas RR Lyrae miembros del cúmulo conduce a los valores medios de la metalicidad y la distancia del cúmulo; [Fe/H]ZW = &#8722;1.35 ±0.22 dex y 11.9±0.6 kpc. Se discute la variabilidad y la membresía de las estrellas reportadas como variables por Gaia-DR3 en el campo del cúmulo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[globular clusters: general]]></kwd>
<kwd lng="en"><![CDATA[globular clusters: individual: NGC 1851]]></kwd>
<kwd lng="en"><![CDATA[stars: distances]]></kwd>
<kwd lng="en"><![CDATA[stars: fundamental parameters]]></kwd>
<kwd lng="en"><![CDATA[stars: horizontal branch]]></kwd>
<kwd lng="en"><![CDATA[stars: variables: RR Lyrae]]></kwd>
</kwd-group>
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