<?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>S0185-11012020000200235</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2020.56.02.06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The ADF and the t2 formalism in HII regions based on the upper mass limit of the IMF for the MW]]></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="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peimbert]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peimbert]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado-Inglada]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Astronomía ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>56</volume>
<numero>2</numero>
<fpage>235</fpage>
<lpage>244</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012020000200235&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012020000200235&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012020000200235&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We study in depth the abundance discrepancy problem in H II regions, this time from a different perspective than the usual one: by studying the effect of the upper mass limit (Mup ) of the initial mass function (IMF) on the O, C, and He predicted by chemical evolution models for the Milky Way. We use abundances determined with the direct method (DM) and with the temperature independent method (TIM). We compare the predicted abundances at the present time with observations of Orion, M17, and M8 to determine the Mup value of the galactic IMF. From the DM abundances, the models predict an    M  u p = 25 - 45   M  &#8857;, while from the TIM, CEMs derive an    M  u p = 70 - 110   M  &#8857;. Spiral galaxies with the stellar mass and star formation rate of the MW are predicted to have an    M  u p &#8776; 100   M  &#8857;. These results support that abundances derived from the TIM are better than those derived from the DM.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Estudiamos el problema de la discrepancia de abundancias en regiones H II a partir del efecto que tiene la masa superior (Mup ) de la función inicial de masa (IMF) en la producción de O, C y He obtenida por modelos de evolución química de nuestra galaxia. Comparamos las abundancias determinadas por el método directo (DM) y por el método independiente de la temperatura (TIM) en Orión, M17 y M8 con las abundancias modeladas actuales para determinar el valor de la Mup de la IMF Galáctica. Al usar las abundancias a partir del DM se requiere que 25 &lt;   M  u p &lt; 40    M  &#8857;, mientras que con las abundancias obtenidas a partir del TIM se requiere que  70 &lt;   M  u p &lt; 110   M  &#8857;. Para galaxias espirales con masa estelar y tasa de formación estelar similar a la VL se ha predicho una    M  u p &#8776; 100   M  &#8857;. Este resultado implica que las abundancias obtenidas por el TIM son más adecuadas que las obtenidas por el DM.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[HII regions]]></kwd>
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