<?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>S0185-11012024000100069</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2024.60.01.05</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Investigation on Four Contact Binary Systems and a Semi-Detached One at the Beginning of the Contact Phase]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acerbi]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martignoni]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Michel]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barani]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aceves]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Altamirano-Dévora]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamayo]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Astronomica Betelgeuse  ]]></institution>
<addr-line><![CDATA[Magnago ]]></addr-line>
<country>Italia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[Ensenada ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Físico-Matemáticas ]]></institution>
<addr-line><![CDATA[ Nuevo León]]></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>69</fpage>
<lpage>81</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012024000100069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012024000100069&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012024000100069&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We present B, V, Rc and Ic light curves of four contact binary systems and one semi-detached system. New observations confirm and revise the short-period (0.22-0.25d) of the systems and that all stars belong to the spectral type K. In J105924 and J164349 a third light was found while the shape of the light curves of four systems (excluding J105924) suggests the presence of inhomogeneities on the surface of one component which confirms that the systems are active. Also they are observed at low orbital inclination  i &#8712; ( 4   1  o , 6   2  o ). The temperature difference range is  &#916; T &#8712; ( 4,640 )K and the mass ratios  q &#8712; ( 0.20,0.75 ). Absolute parameters are estimated using statistical diagrams. The systems follow the general pattern of the relative subtype of W Ursae Majoris systems. The sum of the component masses of four systems is below the mass limit of 1.0 - 1.2 M     &#8857; assumed for the known contact binary stars; this tells us that they belong to the class of low mass contact binaries.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Se presentan curvas de luz en B, V, R  c e I  c de cuatro binarias en contacto y un sistema semi-ligado. Nuevas observaciones confirman y actualizan los cortos períodos (0.22-0.25d) de los sistemas y que todas las estrellas son del tipo espectral K. En J105924 y J164349 se encontró una tercera luz, mientras que en cuatro sistemas (excluyendo J105924) se sugiere la presencia de inhomogeneidad en la superficie de un componente, confirmando que los sistemas están activos. También tienen una inclinación orbital baja  i  &#8712;  ( 4   1  o , 6   2  o ), diferencias en temperatura  &#916; T &#8712; ( 4,640 )K, y cocientes de masa  q &#8712; ( 0.20,0.75 ). Los parámetros absolutos se estiman utilizando diagramas estadísticos. Los sistemas siguen el patrón general del subtipo W Ursae Majoris. La suma de las masas en cuatro sistemas está por debajo del límite de masa de 1.0-1.2M     &#8857;, asumido para las estrellas binarias de contacto conocidas; esto nos dice que pertenecen a la clase de binarias de contacto de baja masa.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[stars]]></kwd>
<kwd lng="en"><![CDATA[individual]]></kwd>
<kwd lng="en"><![CDATA[1SWASP J105924.30+220458.0]]></kwd>
<kwd lng="en"><![CDATA[1SWASP J123609.78+341159.5]]></kwd>
<kwd lng="en"><![CDATA[1SWASP J161858.05+261303.5 (V1458 Her)]]></kwd>
<kwd lng="en"><![CDATA[1SWASP J164349.61+325637.8 (V1475 Her)]]></kwd>
<kwd lng="en"><![CDATA[1SWASP J132308.74+424613.3 (HW CVn)]]></kwd>
<kwd lng="en"><![CDATA[techniques: photometric]]></kwd>
</kwd-group>
</article-meta>
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