<?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>S0185-11012017000200015</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Effects on a Core Collapse of Changes in the Number and Size of Turbulent Modes of Velocity]]></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="Af1">
<institution><![CDATA[,Universidad de Sonora Departamento de Investigación en Física ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></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=S0185-11012017000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000200015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000200015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We consider 28 particle-based simulations aimed at comparing the gravitational collapse of a spherically symmetric, uniform gas core in which two extreme types of turbulent spectra of velocity have been initially induced, so that &#8711;    &#957; &#8594; = 0 (14 simulations) and &#8711;×    &#957; &#8594; = 0 (14 simulations). For all the simulations, the ratios of the kinetic energy and thermal energy to the gravitational energy were fixed at &#946;=0.21 and &#945;=0.24, respectively. Most of the simulations finish by forming a single protostar, except for two simulations that form a binary system of protostars. In order to quantify the differences (or similarities) between the two types of simulations, we calculate some integral properties of the resulting protostars, such as the mass Mf and the ratios &#945;f and &#946;f.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Consideramos 28 simulaciones de partículas diseñadas para comparar el colapso gravitacional de un núcleo de gas uniforme y esféricamente simétrico, en el cual dos tipos extremos de espectros turbulentos de velocidad han sido inicialmente inducidos, de modo que &#8711;·    &#957; &#8594; = 0 (14 simulaciones) y &#8711;×    &#957; &#8594; = 0 (14 simulaciones). En todas las simulaciones las razones de energía cinética y energía térmica con respecto a la energía gravitacional se han fijado en &#946;=0.21 y &#945;=0.24, respectivamente. La mayoría de las simulaciones terminan formando una sola protoestrella, excepto dos simulaciones, en las se forma un sistema binario de protoestrellas. Con el propósito de cuantificar las diferencias (o similitudes) entre los dos tipos de simulaciones, calculamos algunas propiedades integrales de las protoestrellas resultantes, tales como la masa Mf y las razones &#945;f and &#946;f.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[hydrodynamics]]></kwd>
<kwd lng="en"><![CDATA[methods]]></kwd>
<kwd lng="en"><![CDATA[numerical]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
<kwd lng="en"><![CDATA[formation]]></kwd>
<kwd lng="en"><![CDATA[turbulence]]></kwd>
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