<?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>S0185-11012023000200155</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2023.59.02.01</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Astrophysical studies of 9 unstudied open star clusters using GAIA DR3]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Badawy]]></surname>
<given-names><![CDATA[W. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tadross]]></surname>
<given-names><![CDATA[A. L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hendy]]></surname>
<given-names><![CDATA[Y. H. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ismail]]></surname>
<given-names><![CDATA[M. N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mouner]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,National Research Institute of Astronomy and Geo-physics  ]]></institution>
<addr-line><![CDATA[Cairo ]]></addr-line>
<country>Egypt</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Al-Azhar University Faculty of Science ]]></institution>
<addr-line><![CDATA[Cairo ]]></addr-line>
<country>Egypt</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>59</volume>
<numero>2</numero>
<fpage>155</fpage>
<lpage>169</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012023000200155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012023000200155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012023000200155&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Using the Gaia DR3 data sets, this work gives an analysis of nine open clusters: Dolidze 25, Kronberger 13, Kronberger 18, Majaess 99, NGC 7795, Ruprecht 139, Teutsch 55, S1, and FSR 0596, which are close to the Galactic plane of the Milky Way. The number of probable cluster members is found to be 81, 77, 120, 155, 108, 110, 160, and 116 respectively. Radii are determined as 5.40, 5.25, 4.80, 4.20, 4.28, 3.70, 4.30, 4.30, and 3.53 arcmin, respectively. With solar metallicity isochrones log ages of 7.70, 9.00, 8.35, 7.50, 9.00, 8.00, 7.50, 8.50, and 9.5 yr are determined for these clusters. The best fitting of the isochrone produced distances of 2.6, 1.27, 1.16, 1.16, 3.10, 1.64, 2.50, 2.44, and 0.98 kpc that are similar to the distances calculated from inverting median parallaxes. The mass function slopes are in agreement with the Salpeter value. The results of the total masses are found to be 116.07, 79.33, 141.24, 147.34, 145.76, 491.01, 155, 212.46, and 82.79 M&#8857;.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En este trabajo estudiamos, con datos del GAIA DR3, nueve cúmulos abiertos: Dolidze 25, Kronberger 13, Kronberger 18, Majaess 99, NGC 7795, Ruprecht 139, Teutsch 55, S1, y FSR 0596, todos ellos cercanos al plano galáctico. Encontramos que el número de miembros probables es de 81, 77, 120, 155, 108, 110, 160, y 116, respectivamente. Los radios que determinamos son: 5.40, 5.25, 4.80, 4.20, 4.28, 3.70, 4.30, 4.30, y 3.53 arcmin, respectivamente. Si suponemos isocronas con metalicidades solares los logaritmos de las edades en años son: 7.70, 9.00, 8.35, 7.50, 9.00, 8.00, 7.50, 8.50, y 9.5. El mejor ajuste de las isocronas produjo distancias de 2.6, 1.27, 1.16, 1.16, 3.10, 1.64, 2.50, 2.44, y 0.98 kpc, similares a las obtenidas a partir de las paralajes medias. Las pendientes de las funciones de masa concuerdan con el valor de Salpeter. Encontramos valores para las masas totales de 116.07, 79.33, 141.24, 147.34, 145.76, 491.01, 155, 212.46, y 82.79 M&#8857;, respectivamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Hertzsprung-Russell and colour-magnitude diagrams]]></kwd>
<kwd lng="en"><![CDATA[methods: data analysis]]></kwd>
<kwd lng="en"><![CDATA[open clusters and associations: general]]></kwd>
<kwd lng="en"><![CDATA[stars: luminosity function]]></kwd>
<kwd lng="en"><![CDATA[mass function]]></kwd>
</kwd-group>
</article-meta>
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