<?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>S0185-11012013000200017</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Evidence for Past Knot Mergers in the HH34 Jet]]></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-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[,California Institute of Technology Spitzer Science Center ]]></institution>
<addr-line><![CDATA[ CA]]></addr-line>
<country>USA</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>363</fpage>
<lpage>369</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012013000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012013000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012013000200017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Dentro de &#8776;30" de la fuente, el jet de HH34 tiene una cadena de nudos bien alineados. Las posiciones y los movimientos propios de estos nudos pueden ser usados para determinar tiempos dinámicos, y para estimar el período de eyección (tomando diferencias entre los tiempos dinámicos de nudos sucesivos). De esta manera, encontramos mayores períodos estimados para los nudos a mayores distancias de la fuente (o sea, a mayores tiempos dinámicos). Interpretamos este resultado con un modelo en que los nudos tienen una variabilidad azarosa de baja amplitud (&#8776;15-20%) en su velocidad de eyección y un período bien definido de &#8776;16 años, lo cual lleva a la producción de algunos eventos de fusión de nudos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Within &#8776;30" from the outflow source, the HH34 jet has a chain of well aligned knots. The positions and proper motions of these knots can be used to determine dynamical timescales, and estimates of the ejection period (by taking differences between the dynamical timescales of the successive knots). Through this exercise, we find that larger estimated ejection periods are found for the knots further away from the outflow source (i.e., for the knots with larger dynamical timescales). We interpret this result in terms of a model in which the knots have a low amplitude (&#8776;15-20%) random ejection velocity variability and a well defined period of &#8776;16 yr, leading to a few knot-merging events.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Herbig-Haro objects]]></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>Evidence for Past Knot Mergers in the HH34 Jet</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> and A. Noriega&#45;Crespo<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"><sup>1</sup> <i>Instituto de Ciencias Nucleares, Universidad Nacional Aut&oacute;noma de M&eacute;xico, 04510 M&eacute;xico, D.F., M&eacute;xico</i>. (<a href="mailto:raga@nucleares.unam.mx">raga@nucleares.unam.mx</a>).</font></p>      <p align="justify"><font face="verdana" size="2"><sup>2</sup> <i>Spitzer Science Center, California Institute of Technology, CA 91125, USA</i>. (<a href="mailto:alberto@ipac.caltech.edu">alberto@ipac.caltech.edu</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 2013 May 30.    <br> 	Accepted 2013 August 15</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">Dentro de &#8776;30<i>&#34;</i> de la fuente, el jet de HH34 tiene una cadena de nudos bien alineados. Las posiciones y los movimientos propios de estos nudos pueden ser usados para determinar tiempos din&aacute;micos, y para estimar el per&iacute;odo de eyecci&oacute;n (tomando diferencias entre los tiempos din&aacute;micos de nudos sucesivos). De esta manera, encontramos mayores per&iacute;odos estimados para los nudos a mayores distancias de la fuente (o sea, a mayores tiempos din&aacute;micos). Interpretamos este resultado con un modelo en que los nudos tienen una variabilidad azarosa de baja amplitud (&#8776;15&#45;20&#37;) en su velocidad de eyecci&oacute;n y un per&iacute;odo bien definido de &#8776;16 a&ntilde;os, lo cual lleva a la producci&oacute;n de algunos eventos de fusi&oacute;n de nudos.</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">Within &#8776;30<i>&#34;</i> from the outflow source, the HH34 jet has a chain of well aligned knots. The positions and proper motions of these knots can be used to determine dynamical timescales, and estimates of the ejection period (by taking differences between the dynamical timescales of the successive knots). Through this exercise, we find that larger estimated ejection periods are found for the knots further away from the outflow source (i.e., for the knots with larger dynamical timescales). We interpret this result in terms of a model in which the knots have a low amplitude (&#8776;15&#45;20&#37;) random ejection velocity variability and a well defined period of &#8776;16 yr, leading to a few knot&#45;merging events.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key Words:</b> Herbig&#45;Haro objects &#151; ISM: kinematics and dynamics &#151; stars: formation.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
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