<?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>S0185-11012023000100137</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2023.59.01.10</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Photometric Analysis of Eclipsing Binaries: VY UMi, RU UMi and GSC 04364-00648]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kudak]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parimucha]]></surname>
<given-names><![CDATA[&#352;.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Perig]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gajdo&#353;]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Uzhhorod National University  Laboratory of space researches]]></institution>
<addr-line><![CDATA[Uzhhorod ]]></addr-line>
<country>Ucrania</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Pavol Jozef &#352;afárik University in Ko&#353;ice Faculty of Science Institute of Physics]]></institution>
<addr-line><![CDATA[Kosice ]]></addr-line>
<country>Eslovaquia</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>1</numero>
<fpage>137</fpage>
<lpage>150</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012023000100137&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012023000100137&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012023000100137&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We present the photometric analysis of BVR and TESS light curves of three eclipsing binaries, together with their period changes considering archival data and new minima times from our and TESS observations. For the first time we detected wave-like variations with low-amplitude in O &#8722; C residua of RU UMi, which can be interpreted as a consequence of the light-time effect caused by the 3rd component with period 7370 days. The period increase detected in the VY UMi system corresponds to mass transfer from the secondary to the primary component. For the GSC 04364-00648 binary system we find quadratic changes on the O &#8722; C diagram, which correspond to a period decrease. We cannot make assumptions about their nature, mainly due to short time of observation and uneven coverage of O - C diagram. We also determined the absolute parameter of their components using the photometric solution and GAIA distances.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Presentamos el análisis fotométrico de las curvas de luz BVR y TESS, y de los cambios de período de tres binarias eclipsantes, a partir de datos de archivo y nuevos datos de los mínimos de nuestras observaciones y de TESS. Detectamos por primera vez variaciones ondulatorias de baja amplitud en los residuos O - C de RU UMi, que pueden ser consecuencia del efecto de tiempo de luz causado por la tercera componente, con un período de 7370 días. El aumento del período en VY UMi corresponde a la transferencia de masa de la secundaria a la primaria. En GSC 04364-00648 encontramos cambios cuadr´aticos en el diagrama O &#8722; C, que corresponden a una disminución del período. No podemos proponer hip´otesis sobre su naturaleza debido al corto tiempo de observación y a la cobertura inhomogénea en el diagrama O &#8722; C. Determinamos los parámetros absolutos de las componentes mediante la solución fotom´etrica y las distancias de GAIA.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[binaries]]></kwd>
<kwd lng="en"><![CDATA[VY UMi]]></kwd>
<kwd lng="en"><![CDATA[GSC 04364-00648 &#8212; stars]]></kwd>
</kwd-group>
</article-meta>
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