<?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>S0185-11012011000200011</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Cometary Cavity Created by an Aligned Streaming Environment/Collimated Outflow Interaction]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Cámara]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esquivel]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cantó]]></surname>
<given-names><![CDATA[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="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez]]></surname>
<given-names><![CDATA[P. F.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-González]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<volume>47</volume>
<numero>2</numero>
<fpage>323</fpage>
<lpage>331</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012011000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012011000200011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012011000200011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos un modelo analítico de "capa delgada" de la interacción de un chorro biconico y un medio ambiente en movimiento (alineado con la dirección del chorro), así como simulaciones numéricas (axisimétricas) de dicha interacción. Una situación similar, aunque en un escenario más complejo, ocurre en la cabeza de la estructura cometaria de Mira. Por esta razón, en la mayoría de las simulaciones numéricas exploramos parámetros que son consistentes con las observaciones del flujo bipolar de Mira B. Para estos parámetros la interacción es no-radiativa, lo que tiene como resultado una zona de interacción chorro/medio ambiente bastante ancha. A pesar de esto, encontramos que el modelo analítico de capa delgada describe de manera satisfactoria la morfología básica del flujo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present a "thin shell" model of the interaction of a biconical outflow and a streaming environment (aligned with the direction of the flow), as well as numerical (axisymmetric) simulations of such an interaction. A similar situation, although in a more complex setup, takes place at the head of the cometary structure of Mira. Thus, for most of the numerical simulations we explore parameters consistent with the observed bipolar outflow from Mira B. For these parameters, the interaction is non-radiative, so that a rather broad jet/streaming environment interaction region is formed. In spite of this, a reasonable agreement between the thin-shell analytic model and the numerical simulations is obtained.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[hydrodynamics]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="4"><b>The Cometary Cavity Created by an Aligned Streaming Environment/Collimated Outflow Interaction</b></font></p> 	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="center"><font face="verdana" size="2"><b>D. L&oacute;pez&#150;C&aacute;mara,<sup>1</sup> A. Esquivel,<sup>1</sup> J. Cant&oacute;,<sup>2</sup> A. C. Raga,<sup>1</sup> P. F. Vel&aacute;zquez,<sup>1</sup> and A. Rodr&iacute;guez&#150;Gonz&aacute;lez<sup>1</sup></b></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apdo. Postal 70&#150;543, M&eacute;xico 04510 D.F., M&eacute;xico</i> (d.lopez, esquivel, raga, pablo, <a href="mailto:ary@nucleares.unam.mx">ary@nucleares.unam.mx</a>).</font> </p> 	    <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Instituto de Astronom&iacute;a, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apdo. Postal 70&#150;264, M&eacute;xico,04510 D.F., M&eacute;xico.</i></font></p> 	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2">Received 2011 May 20    ]]></body>
<body><![CDATA[<br>     Accepted 2011 June 16</font></p> 	    <p align="justify"><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">Presentamos un modelo anal&iacute;tico de "capa delgada" de la interacci&oacute;n de un chorro biconico y un medio ambiente en movimiento (alineado con la direcci&oacute;n del chorro), as&iacute; como simulaciones num&eacute;ricas (axisim&eacute;tricas) de dicha interacci&oacute;n. Una situaci&oacute;n similar, aunque en un escenario m&aacute;s complejo, ocurre en la cabeza de la estructura cometaria de Mira. Por esta raz&oacute;n, en la mayor&iacute;a de las simulaciones num&eacute;ricas exploramos par&aacute;metros que son consistentes con las observaciones del flujo bipolar de Mira B. Para estos par&aacute;metros la interacci&oacute;n es no&#150;radiativa, lo que tiene como resultado una zona de interacci&oacute;n chorro/medio ambiente bastante ancha. A pesar de esto, encontramos que el modelo anal&iacute;tico de capa delgada describe de manera satisfactoria la morfolog&iacute;a b&aacute;sica del flujo.</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">We present a "thin shell" model of the interaction of a biconical outflow and a streaming environment (aligned with the direction of the flow), as well as numerical (axisymmetric) simulations of such an interaction. A similar situation, although in a more complex setup, takes place at the head of the cometary structure of Mira. Thus, for most of the numerical simulations we explore parameters consistent with the observed bipolar outflow from Mira B. For these parameters, the interaction is non&#150;radiative, so that a rather broad jet/streaming environment interaction region is formed. In spite of this, a reasonable agreement between the thin&#150;shell analytic model and the numerical simulations is obtained.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b><i>Key Words:</i></b> hydrodynamics &#8212; ISM: kinematics and dynamics &#8212; ISM: jets and outflows &#8212; stars: AGB and post&#150;AGB &#8212; stars: mass&#150;loss</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/v47n2/v47n2a11.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>ACKNOWLEDGMENTS</b></font></p> 	    <p align="justify"><font face="verdana" size="2">DLC work has been possible thanks to a DGAPA postdoctoral grant from the UNAM. We also acknowledge support from CONACyT grants 61547, 101256, and 101975. We thank Enrique Palacios and Mart&iacute;n Cruz for supporting the servers in which the calculations of this paper were carried out.</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">Bowers, P. F., &amp; Knapp, G. 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