<?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>S0185-11012011000200008</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[An Intepretive Ballistic Model for Quasi-Symmetric Bipolar Jet Systems]]></article-title>
</title-group>
<contrib-group>
<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[Noriega-Crespo]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Ramírez]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lora]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stapelfeldt]]></surname>
<given-names><![CDATA[K. R.]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carey]]></surname>
<given-names><![CDATA[S. J.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ciencias Nucleares ]]></institution>
<addr-line><![CDATA[ D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="A02">
<institution><![CDATA[,SPITZER Science Center  ]]></institution>
<addr-line><![CDATA[Pasadena CA]]></addr-line>
<country>USA</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universitüt Heidelberg Institut Zentrum für Astronomie Astronomisches Rechen]]></institution>
<addr-line><![CDATA[Heidelberg ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Jet propulsion Laboratory  ]]></institution>
<addr-line><![CDATA[Pasadena CA]]></addr-line>
<country>USA</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>289</fpage>
<lpage>295</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012011000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012011000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012011000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos un modelo analítico, balístico para sistemas de chorros/contrachorros cuasi-simetricos, considerando tanto el caso no relativista como el relativista. El modelo considera la presencia de asimetrías en el tiempo y en la velocidad de eyección, las cuales producen diferencias entre las posiciones de los nudos a lo largo del chorro y del contra-chorro. Un ajuste de las predicciones del modelo no relativista a observaciones de dos flujos HH cuasi-simetricos (HH 34 y HH 111) nos permite obtener las magnitudes de las asimetrías de tiempo y velocidad de eyección de estos sistemas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present an analytic, ballistic model for quasi-symmetric jet/counterjet systems, considering both the non-relativistic and the relativistic cases. The model considers the presence of ejection time and velocity asymmetries, which produce offsets between the positions of the knots in jet/counterjet pairs. A fit of the non-relativistic model predictions to observations of two quasi-symmetric HH outflows (HH 34 and HH 111) allows us to obtain the magnitudes of the ejection time and velocity asymmetries of these systems.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Herbig-Haro objects]]></kwd>
<kwd lng="en"><![CDATA[infrared]]></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="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>An Intepretive Ballistic Model for Quasi&#150;Symmetric Bipolar Jet Systems</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>A. C. Raga,<sup>1</sup> A. Noriega&#150;Crespo,<sup>2</sup> J. C. Rodr&iacute;guez&#150;Ram&iacute;rez,<sup>1</sup> V. Lora,<sup>3</sup> K. R. Stapelfeldt,<sup>4</sup> and S. J. Carey<sup>2</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, 04510 D.F., Mexico</i> (raga, <a href="mailto:juan.rodriguez@nucleares.unam.mx">juan.rodriguez@nucleares.unam.mx</a>).</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2 </sup>SPITZER Science Center, California Institute of Technology, Pasadena, CA 91125, USA</i> (carey, <a href="mailto:alberto@ipac.caltech.edu">alberto@ipac.caltech.edu</a>).</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>3 </sup>Astronomisches Rechen&#150;Institut Zentrum f&uuml;r Astronomie der Universit&uuml;t Heidelberg, M&ouml;nchhofstr. 12&#150;14 69120 Heidelberg, Germany</i> (<a href="mailto:vlora@ari.uni&#150;heidelberg.de">vlora@ari.uni&#150;heidelberg.de</a>).</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>4</sup> Jet propulsion Laboratory, California Institute of Technology, MS 183&#150;900, 4800 Oak Grove Drive, Pasadena, CA 91109, USA</i> (<a href="mailto:krs@exoplanet.jpl.nasa.gov">krs@exoplanet.jpl.nasa.gov</a>).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Received 2011 April 10    <br>   Accepted 2011 June 6</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, bal&iacute;stico para sistemas de chorros/contrachorros cuasi&#150;simetricos, considerando tanto el caso no relativista como el relativista. El modelo considera la presencia de asimetr&iacute;as en el tiempo y en la velocidad de eyecci&oacute;n, las cuales producen diferencias entre las posiciones de los nudos a lo largo del chorro y del contra&#150;chorro. Un ajuste de las predicciones del modelo no relativista a observaciones de dos flujos HH cuasi&#150;simetricos (HH 34 y HH 111) nos permite obtener las magnitudes de las asimetr&iacute;as de tiempo y velocidad de eyecci&oacute;n de estos sistemas.</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 an analytic, ballistic model for quasi&#150;symmetric jet/counterjet systems, considering both the non&#150;relativistic and the relativistic cases. The model considers the presence of ejection time and velocity asymmetries, which produce offsets between the positions of the knots in jet/counterjet pairs. A fit of the non&#150;relativistic model predictions to observations of two quasi&#150;symmetric HH outflows (HH 34 and HH 111) allows us to obtain the magnitudes of the ejection time and velocity asymmetries of these systems.</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key Words:</i></b> Herbig&#150;Haro objects &#8212; infrared: ISM &#8212; ISM: individual objects (HH 34, HH 111) &#8212; ISM: jets and outflows &#8212; stars: formation.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><a href="/pdf/rmaa/v47n2/v47n2a8.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>ACKNOWLEDGMENTS</b></font></p>     <p align="justify"><font face="verdana" size="2">This work was supported by the Conacyt grants 61547, 101356 and 101975.</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">Bally, J., &amp; Reipurth, B. 2001, ApJ, 546, 299.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7435387&pid=S0185-1101201100020000800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Cabrit, S., Codella, C., Gueth, F., Nisini, B., Gusdorf, A., Dougados, C., &amp; Bacciotti, F. 2007, A &amp; A, 468, L29.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7435389&pid=S0185-1101201100020000800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     ]]></body>
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