<?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>S0185-11012008000200009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The Helium and heavy elements enrichment of the Galactic Disk]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carigi]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peimbert]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,University of Central Lancashire Centre for Astrophysics ]]></institution>
<addr-line><![CDATA[Preston Lancashire]]></addr-line>
<country>United Kingdom</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2008</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>341</fpage>
<lpage>354</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012008000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012008000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012008000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos modelos de evolución química para el disco de nuestra galaxia. También presentamos una nueva determinación de X, Y, y Z para M17, una región H <img border=0 src="../../../../../img/revistas/rmaa/v44n2/a9s1.jpg">de nuestra galaxia rica en elementos pesados. Comparamos nuestros modelos del disco galáctico con las abundancias de las regiones H <img border=0 src="../../../../../img/revistas/rmaa/v44n2/a9s1.jpg">. El valor predicho por nuestro modelo para &#916;Y/&#916;O es muy similar al valor que obtenemos por medio de las observaciones de M17 y la abundancia primordial de helio, Yp. A partir de M17 y Yp obtenemos que &#916;Y/&#916;Z = 1.97 ± 0.41, resultado que concuerda con dos determinaciones de &#916;Y/&#916;Z, obtenidas a partir de observaciones de estrellas enanas K de la vecindad solar, que corresponden a 2.1 ± 0.4 y 2.1 ± 0.9 respectivamente. Nuestros modelos ajustan razonablemente bien el valor de O/H con el que se formó el Sol.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present chemical evolution models for the Galactic disk. We also present a new determination of X, Y, and Z for M17 a Galactic metal-rich H <img border=0 src="../../../../../img/revistas/rmaa/v44n2/a9s1.jpg">region. We compare our models for the Galactic disk with the Galactic H <img border=0 src="../../../../../img/revistas/rmaa/v44n2/a9s1.jpg">regions abundances. The &#916;Y/&#916;O ratio predicted from the Galactic chemical evolution model is in very good agreement with the &#916;Y/&#916;O value derived from M17 and the primordial helium abundance, Yp, taking into account the presence of temperature variations in this H <img border=0 src="../../../../../img/revistas/rmaa/v44n2/a9s1.jpg">region. From the M17 observations we obtain that &#916;Y/&#916;Z = 1.97 ±0.41, in excellent agreement with two &#916;Y/&#916;Z determinations derived from K dwarf stars of the solar vicinity that amount to 2.1 ± 0.4 and 2.1 ± 0.9 respectively. We also compare our models with the solar abundances. The solar and Orion nebula O/H values are in good agreement with our chemical evolution model.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[galaxies: abundances]]></kwd>
<kwd lng="en"><![CDATA[galaxies: evolution]]></kwd>
<kwd lng="en"><![CDATA[H II regions]]></kwd>
<kwd lng="en"><![CDATA[ISM: abundances]]></kwd>
<kwd lng="en"><![CDATA[ISM: individual (M17, Orion nebula)]]></kwd>
<kwd lng="en"><![CDATA[Sun: abundances]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><font face="verdana" size="4"><b>The Helium and heavy elements enrichment of the Galactic Disk</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>L. Carigi<sup>1,2</sup> and M. Peimbert<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 Astronom&iacute;a, Universidad Nacional Aut&oacute;noma de M&eacute;xico, Apdo. Postal 70&#150;264, 04510 M&eacute;xico, D. F., M&eacute;xico. (<a href="mailto:carigi@astroscu.unam.mx">carigi@astroscu.unam.mx</a>, <a href="mailto:lcarigi@uclan.ac.uk">lcarigi@uclan.ac.uk</a>).</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2</sup>&nbsp;Centre for Astrophysics, University of Central Lancashire, Preston, Lancashire, PR1 2HE, United Kingdom. (<a href="mailto:peimbert@astroscu.unam.mx">peimbert@astroscu.unam.mx</a>).</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Received 2008 June 23    <br> Accepted 2008 July 18</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">Presentamos modelos de evoluci&oacute;n qu&iacute;mica para el disco de nuestra galaxia. Tambi&eacute;n presentamos una nueva determinaci&oacute;n de <i>X, Y, </i>y <i>Z </i>para M17, una regi&oacute;n H <img src="/img/revistas/rmaa/v44n2/a9s1.jpg"> de nuestra galaxia rica en elementos pesados. Comparamos nuestros modelos del disco gal&aacute;ctico con las abundancias de las regiones H <img src="/img/revistas/rmaa/v44n2/a9s1.jpg">. El valor predicho por nuestro modelo para &#916;<i>Y</i>/&#916;<i>O </i>es muy similar al valor que obtenemos por medio de las observaciones de M17 y la abundancia primordial de helio, <i>Y<sub>p</sub>. </i>A partir de M17 y <i>Y<sub>p</sub> </i>obtenemos que &#916;<i><i>Y</i></i>/&#916;<i><i>Z</i> = </i>1.97 &plusmn; 0.41, resultado que concuerda con dos determinaciones de &#916;<i>Y</i>/&#916;<i>Z, </i>obtenidas a partir de observaciones de estrellas enanas K de la vecindad solar, que corresponden a 2.1 &plusmn; 0.4 y 2.1 &plusmn; 0.9 respectivamente. Nuestros modelos ajustan razonablemente bien el valor de O/H con el que se form&oacute; el Sol.</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 chemical evolution models for the Galactic disk. We also present a new determination of <i>X, Y, </i>and <i>Z </i>for M17 a Galactic metal&#150;rich H <img src="/img/revistas/rmaa/v44n2/a9s1.jpg"> region. We compare our models for the Galactic disk with the Galactic H <img src="/img/revistas/rmaa/v44n2/a9s1.jpg"> regions abundances. The &#916;<i>Y</i>/&#916;<i>O </i>ratio predicted from the Galactic chemical evolution model is in very good agreement with the &#916;<i>Y</i>/&#916;<i>O </i>value derived from M17 and the primordial helium abundance, <i>Y<sub>p</sub>, </i>taking into account the presence of temperature variations in this H <img src="/img/revistas/rmaa/v44n2/a9s1.jpg"> region. From the M17 observations we obtain that &#916;<i><i>Y</i></i>/&#916;<i><i>Z</i> = </i>1.97 &plusmn;0.41, in excellent agreement with two &#916;<i>Y</i>/&#916;<i>Z </i>determinations derived from K dwarf stars of the solar vicinity that amount to 2.1 &plusmn; 0.4 and 2.1 &plusmn; 0.9 respectively. We also compare our models with the solar abundances. The solar and Orion nebula O/H values are in good agreement with our chemical evolution model.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key Words:</b> galaxies: abundances &#151; galaxies: evolution &#151; H II regions &#151; ISM: abundances &#151; ISM: individual (M17, Orion nebula) &#151; Sun: abundances.</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/v44n2/v44n2a9.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>REFERENCES</b></font></p>     ]]></body>
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