<?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>S0185-11012013000200009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The photoevaporation of a neutral structure by an EUV+FUV radiation field]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lora]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vasconcelos]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raga]]></surname>
<given-names><![CDATA[A. C.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esquivel]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cerqueira]]></surname>
<given-names><![CDATA[A. H.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universität Heidelberg Institut Zentrum für Astronomie Astronomisches Rechen]]></institution>
<addr-line><![CDATA[Heidelberg ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidade Estadual de Santa Cruz Departamento de Ciências Exatas e Tecnológicas Laboratorio de Astrofísica Teórica e Observacional]]></institution>
<addr-line><![CDATA[Ilhéus Bahía]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[ D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2013</year>
</pub-date>
<volume>49</volume>
<numero>2</numero>
<fpage>275</fpage>
<lpage>284</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012013000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012013000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012013000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La radiación fotoionizante EUV y la radiación fotodisociante FUV de estrellas nacientes fotoevaporan la nube donde nacen, llevando a la formación de grumos densos que eventualmente podrían formar estrellas adicionales. Estudiamos los efectos de incluir un flujo fotodisociante FUV, en modelos de fragmentación de una nube molecular fotoevaporada y autogravitante. Llevamos a cabo simulaciones 3D de la interacción de una nube inhomogénea, neutra y autogravitante, con una radiación externa de campos EUV y FUV, y calculamos el número y la masa de los grumos que están en colapso. Encontramos que la presencia de una región de fotodisociación entre la región HII y la nube molecular tiene un efecto importante en la formación de estructuras densas debido a la expansión de una región HII. En particular, incluir un campo FUV lleva a una formación más temprana de un número mayor de grumos densos, los cuales podrían llevar a la formación de un número mayor de estrellas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The EUV photoionizing radiation and FUV dissociating radiation from newly born stars photoevaporate their parental neutral cloud, leading to the formation of dense clumps that could eventually form additional stars. We study the effects of including a photodissociating FUV flux in models of the fragmentation of a photoevaporating, self-gravitating molecular cloud. We compute 3D simulations of the interaction of an inhomogeneous, neutral, self-gravitating cloud with external EUV and FUV radiation fields, and calculate the number of collapsing clumps and their mass. We find that the presence of an outer photodissociation region has an important effect on the formation of dense structures due to the expansion of an HII region. In particular, including a FUV field leads to the earlier formation of a larger number of dense clumps, which might lead to the formation of more stars.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[HII regions]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Articles</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>The photoevaporation of a neutral structure by an EUV+FUV radiation field</b></font></p>      <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>V. Lora,<sup>1</sup> M. J. Vasconcelos,<sup>2</sup> A. C. Raga,<sup>3</sup> A. Esquivel,<sup>3</sup> and A. H. Cerqueira<sup>2</sup></b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="left"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="left"><font face="verdana" size="2"><sup>1</sup> <i>Astronomisches Rechen&#45;Institut Zentrum f&uuml;r Astronomie der Universit&auml;t Heidelberg, M&ouml;nchhofstr, 69120, Heidelberg, Germany</i>. (<a href="mailto:vlora@ari.uni-heidelberg.de" target="_blank">vlora@ari.uni-heidelberg.de</a>).</font></p>  	    <p align="left"><font face="verdana" size="2"><sup>2</sup> <i>Laboratorio de Astrof&iacute;sica Te&oacute;rica e Observacional, DCET&#45;UESC, Ilh&eacute;us, Bah&iacute;a, Brazil</i>. (<a href="mailto:mjvasc@uesc.br">mjvasc@uesc.br</a>, <a href="mailto:hoth@uesc.br">hoth@uesc.br</a>).</font></p>      ]]></body>
<body><![CDATA[<p align="left"><font face="verdana" size="2"><sup>3</sup> <i>Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de M&eacute;xico, 04510, D.F., M&eacute;xico</i>. (<a href="mailto:raga@nucleares.unam.mx">raga@nucleares.unam.mx</a>,<a href="mailto:esquivel@nucleares.unam.mx"> esquivel@nucleares.unam.mx</a>).</font></p>     <p align="left"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="left"><font face="verdana" size="2">Received 2013 February 22.    <br> 	Accepted 2013 June 12.</font></p>  	    <p align="left"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La radiaci&oacute;n fotoionizante EUV y la radiaci&oacute;n fotodisociante FUV de estrellas nacientes fotoevaporan la nube donde nacen, llevando a la formaci&oacute;n de grumos densos que eventualmente podr&iacute;an formar estrellas adicionales. Estudiamos los efectos de incluir un flujo fotodisociante FUV, en modelos de fragmentaci&oacute;n de una nube molecular fotoevaporada y autogravitante. Llevamos a cabo simulaciones 3D de la interacci&oacute;n de una nube inhomog&eacute;nea, neutra y autogravitante, con una radiaci&oacute;n externa de campos EUV y FUV, y calculamos el n&uacute;mero y la masa de los grumos que est&aacute;n en colapso. Encontramos que la presencia de una regi&oacute;n de fotodisociaci&oacute;n entre la regi&oacute;n HII y la nube molecular tiene un efecto importante en la formaci&oacute;n de estructuras densas debido a la expansi&oacute;n de una regi&oacute;n HII. En particular, incluir un campo FUV lleva a una formaci&oacute;n m&aacute;s temprana de un n&uacute;mero mayor de grumos densos, los cuales podr&iacute;an llevar a la formaci&oacute;n de un n&uacute;mero mayor de estrellas.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The EUV photoionizing radiation and FUV dissociating radiation from newly born stars photoevaporate their parental neutral cloud, leading to the formation of dense clumps that could eventually form additional stars. We study the effects of including a photodissociating FUV flux in models of the fragmentation of a photoevaporating, self&#45;gravitating molecular cloud. We compute 3D simulations of the interaction of an inhomogeneous, neutral, self&#45;gravitating cloud with external EUV and FUV radiation fields, and calculate the number of collapsing clumps and their mass. We find that the presence of an outer photodissociation region has an important effect on the formation of dense structures due to the expansion of an HII region. In particular, including a FUV field leads to the earlier formation of a larger number of dense clumps, which might lead to the formation of more stars.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Key Words:</b> HII regions &#151; ISM: clouds &#151; ISM: kinematics and dynamics &#151; stars: formation.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmaa/v49n2/v49n2a9.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>REFERENCES</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Arthur, S. J., Henney, W. 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