<?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>S0185-11012016000100155</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The formation mass of a binary system via fragmentation of a rotating parent core with increasing total mass]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arreaga-García]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Sonora Departamento de Investigación en Física ]]></institution>
<addr-line><![CDATA[ Sonora]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>52</volume>
<numero>1</numero>
<fpage>155</fpage>
<lpage>169</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012016000100155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012016000100155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012016000100155&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: We present a set of numerical simulations of the gravitational collapse of a uniform and rotating core, in which azimuthal symmetric mass seeds are initially implemented in order to favor the formation of a dense filament, out of which a binary system may be formed by direct fragmentation. We observe that this binary formation process is diminished when the total mass of the parent core M 0 is increased; then we increase the level of the ratio of rotational energy to the gravitational energy, denoted by &#946;, initially supplied to the rotating core, in order to achieve the desired direct fragmentation of the filament. We measure the binary mass M f obtained from an initial M 0 and then show a schematic diagram M 0 vs &#946;, where the desired binary configurations are located. We also report some basic physical data of the fragments.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Presentamos un conjunto de simulaciones numéricas del colapso gravitacional de un núcleo uniforme y rotante, en el cual semillas de masa con simetría azimutal se implementan inicialmente con el propósito de favorecer la formación de un filamento denso, a partir del cual un sistema binario se puede formar mediante fragmentación directa. Observamos que este proceso de formación binaria se inhibe cuando la masa total del núcleo progenitor M 0 se incrementa; entonces aumentamos el nivel de la razón de energía rotacional a la energía gravitacional, denotada por &#946;, que se proporciona inicialmente al núcleo rotante con el propósito de lograr la fragmentación directa deseada del filamento. Medimos la masa binaria M f que se obtiene a partir de una masa inicial M 0 y construimos un diagrama esquemático M 0 vs &#946;, en donde las configuraciones binarias deseadas se ubican. También reportamos algunos datos físicos básicos de los fragmentos.]]></p></abstract>
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