<?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>S0185-11012019000100021</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Extensive photometry of V1838 Aql during the 2013 superoutburst]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Echevarría]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Miguel]]></surname>
<given-names><![CDATA[E. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández Santisteban]]></surname>
<given-names><![CDATA[J. V.]]></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[Costero]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[L. J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruelas-Mayorga]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
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<surname><![CDATA[Olivares]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
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</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Buitrago]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jones]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
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<surname><![CDATA[Oskanen]]></surname>
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<surname><![CDATA[Goff]]></surname>
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<surname><![CDATA[Ulowetz]]></surname>
<given-names><![CDATA[J.]]></given-names>
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<surname><![CDATA[Bolt]]></surname>
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<given-names><![CDATA[F.-J]]></given-names>
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<surname><![CDATA[Slauson]]></surname>
<given-names><![CDATA[D.]]></given-names>
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<given-names><![CDATA[W.]]></given-names>
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</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Huelva Departamento de Ciencias Integradas ]]></institution>
<addr-line><![CDATA[Huelva ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Amsterdam Anton Pannekoek Institute for Astronomy ]]></institution>
<addr-line><![CDATA[Amsterdam ]]></addr-line>
<country>Netherlands</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[Ensenada Baja California]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Univ. Bordeaux Laboratoire d&#8217;astrophysique de Bordeaux ]]></institution>
<addr-line><![CDATA[Pessac ]]></addr-line>
<country>France</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,University of California Departament of Physics and Astronomy ]]></institution>
<addr-line><![CDATA[Irvine CA]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,CBA-Oregon Jack Jones Observatory ]]></institution>
<addr-line><![CDATA[Aurora OR]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af8">
<institution><![CDATA[,CBA-Finland Hankasalmi Observatory ]]></institution>
<addr-line><![CDATA[Muurame Finland]]></addr-line>
<country>Finland</country>
</aff>
<aff id="Af9">
<institution><![CDATA[,CBA  ]]></institution>
<addr-line><![CDATA[Sutter Creek CA]]></addr-line>
<country>USA</country>
</aff>
<aff id="A10">
<institution><![CDATA[,CBA Northbrook Meadow Observatory ]]></institution>
<addr-line><![CDATA[Northbrook IL]]></addr-line>
<country>USA</country>
</aff>
<aff id="A11">
<institution><![CDATA[,CBA  ]]></institution>
<addr-line><![CDATA[Craigie Western Australia]]></addr-line>
<country>Australia</country>
</aff>
<aff id="A12">
<institution><![CDATA[,CBA  ]]></institution>
<addr-line><![CDATA[Bozeman MT]]></addr-line>
<country>USA</country>
</aff>
<aff id="A13">
<institution><![CDATA[,CBA Andromeda Observatory ]]></institution>
<addr-line><![CDATA[Mol ]]></addr-line>
<country>Belgium</country>
</aff>
<aff id="A14">
<institution><![CDATA[,CBA Owl Ridge Observatory ]]></institution>
<addr-line><![CDATA[ IA]]></addr-line>
<country>USA</country>
</aff>
<aff id="A15">
<institution><![CDATA[,CBA  ]]></institution>
<addr-line><![CDATA[Las Cruces NM]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>55</volume>
<numero>1</numero>
<fpage>21</fpage>
<lpage>30</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012019000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012019000100021&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012019000100021&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT: We present an in-depth photometric study of the 2013 superoutburst of the recently discovered cataclysmic variable V1838 Aql and subsequent photometry near its quiescent state. A careful examination of the development of the superhumps is presented. Our best determination of the orbital period is PORB = 0.05698(9) days, based on the periodicity of early superhumps. Comparing the superhump periods at stages A and B with the early superhump value we derive a period excess of  &#8712;= 0.024(2) and a mass ratio of q = 0.10(1). We suggest that V1838 Aql is approaching the orbital period minimum and thus has a low-mass star as a donor instead of a substellar object.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN: Presentamos un estudio fotométrico detallado de la super-erupción de V1838 Aql, una variable cataclísmica recientemente descubierta, desde el máximo en 2013 hasta su regreso al mínimo. Examinamos en detalle la evolución de las superjorobas (superhumps). Determinamos el período orbital PORB = 0.05698(9) días a partir de la periodicidad de las superjorobas tempranas. Comparando los períodos de las superjorobas en las etapas A y B con el valor del período orbital, derivamos un valor del cambio en el período orbital de  &#8712; = 0.024(2) y un cociente de masa para el sistema de q = 0.10(1). Sugerimos que V1838 Aql se está acercando al mínimo período orbital, por lo que la secundaria sería una estrella de baja masa y no un objeto sub-estelar.]]></p></abstract>
</article-meta>
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