<?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>S0185-11012020000100063</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2020.56.01.08</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Spectral Behavior of the Symbiotic Nova HM Sge in the Ultraviolet]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sanad]]></surname>
<given-names><![CDATA[M. R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Abdel-Sabour]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,National Research Institute of Astronomy and Geophysics Astronomy Department ]]></institution>
<addr-line><![CDATA[Helwan Cairo]]></addr-line>
<country>Egypt</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>1</numero>
<fpage>63</fpage>
<lpage>69</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012020000100063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012020000100063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012020000100063&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Ultraviolet observations of the symbiotic nova HM Sge were obtained from the International Ultraviolet Explorer (IUE) through the interval from 1980 - 1992. Three line profiles demonstrating the variations of some emission lines at different dates are presented. We determined the reddening of HM Sge from the 2200 Å absorption feature; the estimated value is E(B - V ) = 0:34 ± 0.02. We studied CIV at 1550 Å, He II 1640 Å, and CIII] at 1909 Å produced in the wind from the hot star. The line flux variations at different dates could be explained in terms of the variations of temperature in the emitting region as a result of mass loss variations. The IUE observations can be explained by the models of Girard &amp; Willson (1987); Formiggini et al. (1995).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se obtuvieron observaciones ultravioletas de la nova simbiótica HM Sge mediante el \International Ultraviolet Explorer" (IUE) durante el intervalo de tiempo 1980 - 1992. Se presentan tres perfiles de líneas que demuestran la variación de algunas líneas de emisión en distintos tiempos. Determinamos el enrojecimiento de HM Sge a partir de la absorción en 2200 Å, y obtuvimos un valor estimado de E(B - V ) = 0:34 ± 0:02. Estudiamos el CIV en 1550 Å, el He II en 1640 Å, y el C III] en 1909 Å, líneas que se producen en el viento de la estrella caliente. Las variaciones en el tiempo del flujo de las líneas podrán explicarse en términos de la variación de la temperatura de la región de emisión, como consecuencia de variaciones en la pérdida de masa. Las observaciones del IUE pueden explicarse mediante los modelos de Girard &amp; Willson (1987) y Formiggini et al. (1995).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[binaries: symbiotic]]></kwd>
<kwd lng="en"><![CDATA[stars: individual: HM Sge]]></kwd>
<kwd lng="en"><![CDATA[ultraviolet: stars]]></kwd>
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