<?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>S0185-11012017000200006</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A New Mechanism to Explain the Near-Ir Variability of the Transitional Disk of GM Aur]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nagel]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarez-Meraz]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rendón]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Guanajuato  ]]></institution>
<addr-line><![CDATA[Guanajuato Guanajuato]]></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=S0185-11012017000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT An ubiquitous feature of stellar systems, particularly of transitional disks, is their variability across the full range of the electromagnetic spectrum. The contribution to the near-infrared region of the spectrum comes mainly from the inner region of the disk, where gas and dust are heated to extremely high temperatures. We present a new physical mechanism that can explain the near-infrared variability of some transitional disks. The main process is the intermittent formation of a sublimation wall due to an instability between the magnetic field of the star and the innermost disk region. When the wall is present, it contributes to the spectrum but also shadows part of the material beyond its location. Using this mechanism, we present a model to explain the near-infrared variability of the transitional disk around GM Aur.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Una característica común a los sistemas estelares, particularmente a los discos transicionales, es su variabilidad en el intervalo completo del espectro electromagnético. La contribución a la región del cercano infrarrojo del espectro proviene principalmente de la región interna del disco, donde el gas y el polvo se calientan hasta alcanzar temperaturas muy altas. Proponemos un nuevo mecanismo capaz de explicar la variabilidad en el cercano infrarrojo de algunos discos transicionales. El proceso principal es la formación intermitente de una pared de sublimación debida a una inestabilidad entre el campo magnético de la estrella y la región más interna del disco; cuando la pared esta´ presente, contribuye al espectro pero también oculta parte del material más allá de este punto. Usando este mecanismo, presentamos un modelo para explicar la variabilidad en el cercano infrarrojo del disco transicional alrededor de GM Aur.]]></p></abstract>
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