<?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>S0185-11012013000200006</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The latest eruption of planetary nebula IC 2165]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bohigas]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Dufour]]></surname>
<given-names><![CDATA[R. J.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[Ensenada B. C.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Astrofísica, Óptica y Electrónica  ]]></institution>
<addr-line><![CDATA[Puebla Pue.]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Rice University Physics and Astronomy Department ]]></institution>
<addr-line><![CDATA[Houston Texas]]></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>227</fpage>
<lpage>238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012013000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012013000200006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012013000200006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Espectroscopía de alta dispersión con rendija abierta de la región interna de la nebulosa planetaria (NP) IC 2165, revela que su temperatura es elevada y relativamente uniforme, mientras que la densidad es mucho mayor cerca del núcleo de la NP. Las abundancias indican que no es una NP de tipo I. Una gran cantidad de calcio y hierro está atrapada en granos. La masa ionizada es al menos ~0.05 M&#9737;. Un modelo de fotoionización (Cloudy, version 10.00) que supone una ley del cuadrado inverso para la densidad y abundancias típicas de NP que no son de tipo I, reproduce razonablemente bien el espectro y los cocientes de líneas sensibles a densidad y temperatura, pero no las propiedades globales de la NP. Todo indica que IC 2165 fue producida por una estrella A5 V de 2 M&#9737; y pobre en metales, que arrancó hace unos 2 x 10(9) años.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Open slit high dispersion spectroscopic observations of the inner region of planetary nebula (PN) IC 2165 indicate that the object has a relatively uniform and high electron temperature, with its density being much larger close to the PN nucleus. Abundances imply that it is a non-type I PN. Calcium and iron have been heavily depleted into grains. The ionized mass is at least ~0.05 M&#9737;. A photoionization model (Cloudy, version 10.00) assuming an inverse square law for the density and abundances typical of a non-type I PN, produced a fair replica of the spectrum and of all electron density and temperature sensitive line ratios, but not of the global properties of this object. All evidence indicates that IC 2165 was produced by a metal poor 2 M&#9737; A5 V star that took off some 2 x 10(9) yr ago.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[planetary nebulae]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></kwd>
<kwd lng="en"><![CDATA[ISM]]></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>The latest eruption of planetary nebula IC&nbsp;2165<sup><a href="#notas">1</a></sup></b></font></p>      <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>J. Bohigas,<sup>2</sup> M. Rodr&iacute;guez,<sup>3</sup> and R. J. Dufour<sup>4</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>2</sup> <i>Instituto de Astronom&iacute;a, Universidad Nacional Aut&oacute;noma de M&eacute;xico, 22860 Ensenada, B. C., M&eacute;xico.</i> (<a href="mailto:jbb@astrosen.unam.mx">jbb@astrosen.unam.mx</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>3</sup> <i>Instituto Nacional de Astrof&iacute;sica, &Oacute;ptica y Electr&oacute;nica, 72000 Puebla, Pue., M&eacute;xico.</i> (<a href="mailto:mrodri@inaoep.mx">mrodri@inaoep.mx</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>4</sup> <i>Physics and Astronomy Department, Rice University, 6100 Main MS&#45;61, Houston, Texas 77005&#45;1827, USA.</i> (<a href="mailto:rjd@rice.edu">rjd@rice.edu</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">Received 2013 January 17.    <br> 	Accepted 2013 April 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">Espectroscop&iacute;a de alta dispersi&oacute;n con rendija abierta de la regi&oacute;n interna de la nebulosa planetaria (NP) IC 2165, revela que su temperatura es elevada y relativamente uniforme, mientras que la densidad es mucho mayor cerca del n&uacute;cleo de la NP. Las abundancias indican que no es una NP de tipo I. Una gran cantidad de calcio y hierro est&aacute; atrapada en granos. La masa ionizada es al menos &#126;0.05 <i>M<sub>&#9737;</sub></i>. Un modelo de fotoionizaci&oacute;n (Cloudy, version 10.00) que supone una ley del cuadrado inverso para la densidad y abundancias t&iacute;picas de NP que no son de tipo I, reproduce razonablemente bien el espectro y los cocientes de l&iacute;neas sensibles a densidad y temperatura, pero no las propiedades globales de la NP. Todo indica que IC 2165 fue producida por una estrella A5 V de 2 <i>M<sub>&#9737;</sub></i> y pobre en metales, que arranc&oacute; hace unos 2 x 10<sup>9</sup> a&ntilde;os.</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">Open slit high dispersion spectroscopic observations of the inner region of planetary nebula (PN) IC 2165 indicate that the object has a relatively uniform and high electron temperature, with its density being much larger close to the PN nucleus. Abundances imply that it is a non&#45;type I PN. Calcium and iron have been heavily depleted into grains. The ionized mass is at least &#126;0.05 <i>M<sub>&#9737;</sub></i>. A photoionization model (Cloudy, version 10.00) assuming an inverse square law for the density and abundances typical of a non&#45;type I PN, produced a fair replica of the spectrum and of all electron density and temperature sensitive line ratios, but not of the global properties of this object. All evidence indicates that IC 2165 was produced by a metal poor 2 <i>M<sub>&#9737;</sub></i> A5 V star that took off some 2 x 10<sup>9</sup> yr ago.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key Words:</b> planetary nebulae: general &#151; ISM: abundances &#151; ISM: individual (IC 2165).</font></p>  	    ]]></body>
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<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a name="notas"></a><b>Note</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>1</sup> <i>Based on observations collected at the Observatorio Astron&oacute;mico Nacional in San Pedro M&aacute;rtir, B. C, Mexico.</i></font></p>      ]]></body><back>
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