<?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>S0185-11012016000200399</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Chemical abundances for A-and F-type supergiant stars]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molina]]></surname>
<given-names><![CDATA[R. E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Experimental del Táchira Laboratorio de Investigación en Física Aplicada y Computacional ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<volume>52</volume>
<numero>2</numero>
<fpage>399</fpage>
<lpage>411</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012016000200399&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012016000200399&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012016000200399&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: We present the stellar parameters and elemental abundances of a set of A-F-type supergiant stars HD 45674, HD 180028, HD 194951 and HD 224893 using high resolution (R &#8776; 42, 000) spectra taken from ELODIE library. We present the first results of the abundance analysis for HD 45674 and HD 224893. We rea&#64259;rm the abundances for HD 180028 and HD 194951 studied previously by Luck. Alpha-elements indicate that the objects belong to the thin disc population. Their abundances and their location on the Hertzsprung-Russell diagram seem to indicate that HD 45675, HD 194951 and HD 224893 are in the post-first dredge-up (post-1DUP) phase, and that they are moving in the red-blue loop region. HD 180028, on the contary, shows typical abundances of Population I, but its evolutionary status cannot be satisfactorily defined.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Hemos efectuado un análisis detallado de las abundancias químicas de cuatro objetos supergigantes HD 45674, HD 180028, HD 194951 y HD 224893, usando espectros de alta resolución (R &#8776; 42, 000) tomados de la librería ELODIE. Se presentan los primeros resultados de las abundancias para HD 45674 y HD 224893, y se reafirman las abundancias para HD 180028 y HD 194951 calculadas por Luck. Los elementos alfa nos indican que todos los objetos estudiados pertenecen a la población del disco galáctico. Sus abundancias y su localización en el diagrama Hertzsprung-Russell parecen indicarnos que HD 45675, HD 194951 y HD 224893 evolutivamente se encuentran en la fase posterior al primer dragado (post-1DUP) y se mueven en la región del lazo rojo-azul (red-blue loop). HD 190028 muestra abundancias típicas de la Población I pero su estado evolutivo no puede ser definido satisfactoriamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[stars: abundances]]></kwd>
<kwd lng="en"><![CDATA[stars: atmospheres]]></kwd>
<kwd lng="en"><![CDATA[stars: evolution]]></kwd>
<kwd lng="en"><![CDATA[super-giants]]></kwd>
</kwd-group>
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