<?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>S0185-11012017000100151</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Abundances in photoionized nebulae of the local group and nucleosynthesis of intermediate mass stars]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Maciel]]></surname>
<given-names><![CDATA[W. J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Costa]]></surname>
<given-names><![CDATA[R. D. D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cavichia]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade de Sao Paulo Instituto de Astronomia, Geofísica e Ciencias Atmosféricas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal de Itajubá Instituto de Física e Química ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>53</volume>
<numero>1</numero>
<fpage>151</fpage>
<lpage>166</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012017000100151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000100151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000100151&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Photoionized nebulae, comprising HII regions and planetary nebulae, are excellent laboratories to investigate the nucleosynthesis and chemical evolution of several elements in the Galaxy and other galaxies of the Local Group. Our purpose in this investigation is threefold: (i) compare the abundances of HII regions and planetary nebulae in each system in order to investigate the differences derived from the age and origin of these objects, (ii) compare the chemical evolution in different systems, such as the Milky Way, the Magellanic Clouds, and other galaxies of the Local Group, and (iii) investigate to what extent the nucleosynthesis contributions from the progenitor stars affect the observed abundances in planetary nebulae, which constrains the nucleosynthesis of intermediate mass stars. We show that all objects in the samples present similar trends concerning distance-independent correlations, and some constraints can be defined on the production of He and N by the PN progenitor stars.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las nebulosas fotoionizadas, incluyendo regiones HII y nebulosas planetarias, son excelentes laboratorios para investigar la nucleosíntesis y la evolución química de varios elementos, en nuestra galaxia y en galaxias del Grupo Local. En este trabajo: (i) comparamos las abundancias en regiones HII y nebulosas planetarias para investigar las diferencias que se derivan de las edades y el origen de estos objetos; (ii) comparamos la evolución química en distintos sistemas, como la Vía Láctea, las Nubes de Magallanes y otras galaxias del Grupo Local; (iii) investigamos qué tanto la contribución de las estrellas progenitoras a la nucleosíntesis afecta las abundancias observadas en las nebulosas planetarias, lo cual constriñe la nucleosíntesis de estrellas de masa intermedia. Mostramos que todos los objetos estudiados presentan tendencias similares en cuanto a las correlaciones independientes de las distancias, y encontramos que pueden definirse límites a la producción de He y N en las estrellas progenitoras de las nebulosas planetarias.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Galaxies: Abundances - Galaxies: Disk - ISM: abundances - ISM: planetary nebulae: general]]></kwd>
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