<?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>S0185-11012024000200277</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2024.60.02.06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Long term CCD photometry of the distant cluster NGC2419: the CMD revisited]]></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[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 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[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[García Pérez]]></surname>
<given-names><![CDATA[G. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rios Segura]]></surname>
<given-names><![CDATA[G.]]></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[,Indian Institute of Astrophysics  ]]></institution>
<addr-line><![CDATA[Bangalore ]]></addr-line>
<country>India</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Córdoba Observatorio Astronómico ]]></institution>
<addr-line><![CDATA[Córdoba ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Astrofísica, Óptica y Electrónica  ]]></institution>
<addr-line><![CDATA[Tonantzintla Pue.]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Veracruzana Facultad de Física ]]></institution>
<addr-line><![CDATA[Xalapa ]]></addr-line>
<country>Mexico</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>277</fpage>
<lpage>292</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012024000200277&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012024000200277&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012024000200277&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Employing VI images of NGC 2419 acquired over 17 years, light curves for most of the known variables in the field of the cluster are produced. A cluster membership analysis for about 3100 stars in the cluster field with proper motions from Gaia-DR3 revealed the presence of member stars as far as 140 pc from the cluster center and enabled the construction of a cleaner CMD free of field stars. It was found that RRab and RRc stars share the inter-order region in the instability strip, which is unusual for OoII clusters. Theoretical considerations confirm that Pop II cepheids are descendants of extreme ZAHB blue tail stars with very thin envelopes of about 10% of the total mass. Member RR Lyrae stars were employed to calculate independent estimates of the mean cluster metallicity and distance; we found [Fe/H]UV = &#8722;1.90 ± 0.27 and D = 86.3 ± 5.0 kpc from the RRab and [Fe/H]UV = &#8722;1.88 ± 0.30 and D = 83.1 ± 8.1 kpc from the RRc light curves.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Con imágenes CCD VI del cúmulo globular NGC 2419, obtenidas durante 17 años, hemos construido curvas de luz de gran parte de las estrellas variables en el campo del cúmulo. A partir de un análisis de membresía basado en los movimientos propios de Gaia-DR3 de 3100 estrellas, detectamos miembros a distancias de 140 pc del centro del cúmulo, y construimos un diagrama color-magnitud libre de estrellas de campo. Encontramos que los dos modos de pulsación RRab y RRc comparten la región bimodal de la zona de inestabilidad, lo cual es inesperado en cúmulos Oo II. Nuestros modelos confirman que las estrellas cefeidas de Pob II provienen del extremo azul de la ZAHB con envolventes muy delgadas, de &#8776; 10% de la masa total. A partir de estrellas RR Lyrae miembros calculamos la metalicidad y distancia medias del cúmulo [Fe/H]UV = &#8722;1.90 ± 0.27 y D = 86.3 ± 5.0 kpc para estrellas RRab, y [Fe/H]UV = &#8722;1.88 ± 0.30 y D = 83.1 ± 8.1 kpc para estrellas RRc.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[globular clusters: general]]></kwd>
<kwd lng="en"><![CDATA[globular clusters: individual: NGC 2419]]></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>
</article-meta>
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