<?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>S0185-11012017000200025</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Proper Motions of L1551 IRS 5 Binary System Using 7 mm VLA Observations]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villa]]></surname>
<given-names><![CDATA[A. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trinidad]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fuente]]></surname>
<given-names><![CDATA[E. de la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Esnard]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Guanajuato Departamento de Astronomía ]]></institution>
<addr-line><![CDATA[Guanajuato Gto]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara Departamento de Física ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012017000200025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000200025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000200025&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We analyzed high angular resolution observations of the Very Large Array archive at a wavelength of 7 mm made for the L1551 IRS 5 binary system. Six sets of observations, five with the A configuration and one with the B configuration, were used, covering a time span of about 15 years. With these multi-epoch data, we estimated the absolute and relative proper motions of the binary system, which are about 25.1 mas yr&#8722;1 (&#8776; 16.7 km s&#8722;1 considering a distance of 140 pc) and 4.2 mas yr&#8722;1, respectively. Finally, based on the relative proper motion, we estimated a total mass for the L1551 IRS 5 binary system of 1.7 M&#8857; and an orbital period of 246 years.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Analizamos observaciones de alta resolución angular del archivo del Arreglo Muy Grande (Very Large Array) a una longitud de onda de 7 mm del sistema binario L1551 IRS 5. Se usaron seis conjuntos de observaciones, cinco con la configuración A y uno con la B, cubriendo un intervalo de tiempo de alrededor de 15 años. Con estos datos multiépoca estimamos los movimientos propios absolutos y relativos del sistema binario, los cuales son alrededor de 25.1 mas yr&#8722;1 (&#8776; 16.7 km s&#8722;1 considerando una distancia de 140 pc) y 4.2 mas yr&#8722;1, respectivamente. Finalmente, en base al movimiento propio relativo estimamos una masa total del sistema binario L1551 IRS 5 de 1.7 M&#8857; y un periodo orbital of 246 años.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[astrometry]]></kwd>
<kwd lng="en"><![CDATA[binaries: general]]></kwd>
<kwd lng="en"><![CDATA[circumstellar matter]]></kwd>
<kwd lng="en"><![CDATA[ISM: individual (L1551 IRS 5)]]></kwd>
<kwd lng="en"><![CDATA[stars: formation]]></kwd>
</kwd-group>
</article-meta>
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