<?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>S0185-11012022000100073</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2022.58.01.06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[First Light Curve Analysis of the Moderate Fill-Out Contact Binary Systems TYC 2402-643-1, TYC 2703-1235-1 and TYC 2913-2145-1]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barani]]></surname>
<given-names><![CDATA[Carlo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acerbi]]></surname>
<given-names><![CDATA[Francesco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Popov]]></surname>
<given-names><![CDATA[Velimir]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,aff1  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Italy</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,aff2  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Italy</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Shumen University Department of Physics and Astronomy ]]></institution>
<addr-line><![CDATA[Shumen ]]></addr-line>
<country>Bulgaria</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>58</volume>
<numero>1</numero>
<fpage>73</fpage>
<lpage>82</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012022000100073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012022000100073&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012022000100073&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We present the results of our study of the W Ursae Majoris eclipsing binary systems (EW) TYC 2402-643-1, TYC 2703-1235-1 and TYC 2913-2145-1 based on CCD observations obtained using Sloan g&#8217; and i&#8217; filters. The light curves were analysed using the latest version of the Wilson-Devinney code, and the obtained data were used to estimate the physical parameters of the systems. TYC 2402-643-1 and TYC 2913-2145-1, having mass ratio &lt; 0.25, can be classified as Extreme Mass Ratio Binary (EMRBs) systems and belong to the A-subtype class of the EW. The third one, TYC 2703-1235-1, having mass ratio q about 3 (1/q = 0.33) belongs to W-subtype class of the EW. The absolute dimensions of the primaries and secondaries were estimated and investigated using different evolutionary diagrams. The parameters of the progenitors of the components of the systems were calculated and the results are consistent with the determination of the subtypes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Presentamos los resultados de nuestro estudio de tres binarias eclipsantes de tipo W Ursae Majoris: TYC 2402-643-1, TYC 2703-1235-1 y TYC 2913-2145-1, basado en observaciones CCD con los filtros Sloan g&#8217; e i&#8217;. Se analizaron las curvas de luz con la última versión del código Wilson-Devinney, y con los datos obtenidos se estimaron los parámetros físicos de los sistemas. TYC 2402-643-1 y TYC 2913-2145-1, con un cociente de masas de &lt; 0.25, pueden ser clasificadas como binarias con cociente de masas extremo (EMRBs) y pertenecen al subtipo A de las EW. TYC 2703-1235-1, con un cociente de masas q de aproximadamente 3 (1/q = 0.33) pertenece al subtipo W de las EW. Se investigaron las dimensiones absolutas de las primarias y de las secundarias con distintos diagramas evolutivos. Se calcularon los parámetros de las progenitoras de las componentes de los sistemas. Los resultados concuerdan con las determinaciones de los subtipos.]]></p></abstract>
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