<?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>S0185-11012024000100099</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2024.60.01.07</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The First Multicolour Photometry of The V840 Lyr Contact Binary Star]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tanr&#305;ver]]></surname>
<given-names><![CDATA[Mehmet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Michel]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bulut]]></surname>
<given-names><![CDATA[Ahmet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aceves]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Keskin]]></surname>
<given-names><![CDATA[Ahmet]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Erciyes Faculty of Science Department of Astronomy and Space Science]]></institution>
<addr-line><![CDATA[Kayseri ]]></addr-line>
<country>Turquía</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Erciyes Astronomy and Space Science Observatory Application and Research Center ]]></institution>
<addr-line><![CDATA[Kayseri ]]></addr-line>
<country>Turquía</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomia ]]></institution>
<addr-line><![CDATA[Ensenada BC]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of Çanakkale Onsekiz Mart Faculty of Science Department of Physics]]></institution>
<addr-line><![CDATA[Çanakkale ]]></addr-line>
<country>Turquia</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,University of Çanakkale Onsekiz Mart Astrophysics Research Centre and Observatory ]]></institution>
<addr-line><![CDATA[Çanakkale ]]></addr-line>
<country>Turquia</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>99</fpage>
<lpage>111</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012024000100099&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012024000100099&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012024000100099&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Light curves for the total-eclipsing binary system V840 Lyr in the V, Rc, and I c bands are presented; these display the O&#8217;Connell effect. Analysis was performed with the Phoebe031a software revealing that V840 Lyr is a W-type contact binary with a degree of contact factor of  f = 15.1 ± 5.6 %, a mass ratio of  q = 0.4509 ± 0.0705, an inclination of i = 86.7°, and a temperature difference of  &#916; T = 45 K. An asymmetry in the light curves was modeled assuming a cool spot located on the secondary star. The period changes of the system are examined by combining our recently found times of light minima together with those in the literature. Absolute parameters were obtained as    M  1 = 0.74   M  &#8857; ,     M  2 = 0.34   M  &#8857; ,     R  1 = 0.74   R  &#8857;, and    R  2 = 0.51   R  &#8857; from our photometric solutions, using some empirical relations. The long-term period increase and the contact configuration indicate that V840 Lyr will evolve into a fill-out overcontact binary.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Presentamos curvas de luz V, Rc , e Ic para el sistema binario totalmente eclipsante V840 Lyr; las cuales manifiestan el efecto O&#8217;Connell. Se hace el análisis usando el paquete Phoebe031a; encontramos que V840 Lyr es una binaria de contacto tipo-W, con factor de contacto  f = 15.1 ± 5.6 %, razón de masa  q = 0.4509 ± 0.0705, una inclinación de i = 86.7°, y diferencia de temperatura de  &#916; T = 45 K. Modelamos una asimetría en las curvas de luz asumiendo un mancha fría ubicada en la estrella secundaria. Los cambios de período del sistema se examinaron combinando nuestros tiempos mínimos de luz en conjunto con los de la literatura. Los parámetros absolutos obtenidos    M  1 = 0.74   M  &#8857; ,     M  2 = 0.34   M  &#8857; ,     R  1 = 0.74   R  &#8857;, y    R  2 = 0.51   R  &#8857; resultan de nuestras soluciones fotométricas y utilizando relaciones empíricas. El aumento del período a largo plazo y la configuración de contacto indican que V840 Lyr evolucionará hacia una binaria de sobrecontacto rellena.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[stars: binaries: eclipsing]]></kwd>
<kwd lng="en"><![CDATA[stars: binaries: general]]></kwd>
<kwd lng="en"><![CDATA[stars: individual: V840 Lyr]]></kwd>
</kwd-group>
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