<?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>S0185-11012024000100083</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2024.60.01.06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[CCD Photometry of the Globular Cluster NGC 5897]]></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[Macías-Estrada]]></surname>
<given-names><![CDATA[E.]]></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-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara Instituto de Astronomía y Meteorología ]]></institution>
<addr-line><![CDATA[Guadalajara Jal.]]></addr-line>
<country>México</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>1</numero>
<fpage>83</fpage>
<lpage>98</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012024000100083&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012024000100083&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012024000100083&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We report CCD photometric observations of the globular cluster NGC 5897, in the Johnson system filters B, V, R, and I. With the values for these magnitudes we obtain various colour indices and produce several colour-magnitude diagrams. We present eight colour-magnitude diagramas: V vs B - V, B vs B - V, V vs V - I, I vs V - I, R vs R - I, I vs R - I, V vs V - R, and R vs V - R. In all of these diagrams we can clearly see the giant branch, the horizontal branch and the beginning of the main sequence. To the left of the main sequence turn-off point we detect a somewhat large number of blue straggler stars. We determine the mean value of the visual magnitude of the HB as  16.60 ± 0.46. This value is fainter than the value found by other authors.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Se reportan observaciones fotométricas del cúmulo globular NGC 5897 en los filtros del sistema de Johnson B, V, R e I. Con los valores de estas magnitudes obtenemos diferentes índices de color y producimos varios diagramas color-magnitud. Presentamos ocho diagramas color-magnitud V vs B - V, B vs B - V, V vs V - I, I vs V - I, R vs R - I, I vs R - I, V vs R - I, y R vs V - R. En todos estos diagramas se distinguen claramente la rama de las gigantes, la rama horizontal y el comienzo de la secuencia principal. A la izquierda del punto de salida de la secuencia principal detectamos un número relativamente grande de estrellas &#8216;blue stragglers&#8217;. Determinamos el promedio de la magnitud visual de la rama horizontal como  16.60 ± 0.46. Este valor es más débil que el valor encontrado por otros autores.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Galaxy: general]]></kwd>
<kwd lng="en"><![CDATA[globular clusters: individual: NGC 5897]]></kwd>
<kwd lng="en"><![CDATA[techniques: photometric]]></kwd>
</kwd-group>
</article-meta>
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