<?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>S0185-11012021000100091</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2021.57.01.06</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[A Study of the Time Variability and Line Profile Variations of &#954; Dra]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saad]]></surname>
<given-names><![CDATA[S. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nouh]]></surname>
<given-names><![CDATA[M. I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Shokry]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zead]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,National Research Institute of Astronomy and Geophysics  ]]></institution>
<addr-line><![CDATA[Cairo ]]></addr-line>
<country>Egypt</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Kottamia Center of Scientific Excellence for Astronomy and Space Research  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2021</year>
</pub-date>
<volume>57</volume>
<numero>1</numero>
<fpage>91</fpage>
<lpage>105</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012021000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012021000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012021000100091&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT We present a spectroscopic analysis of the bright Be star &#954;Dra. Two independent sets of radial velocity (RV) measurements were obtained by direct measurement and using a line profile disentangling technique. By combining solutions from codes FOTEL and KOREL, we derived improved orbital elements. From the RVs of the Balmer lines and also from some strong metallic lines we found that all RV variations are phase-locked with the orbital period. V /R variations were obtained for H&#945;, H&#946;, H&#947; and some other photospheric lines. A moving absorption bump superposed over the emission line profies was detected. The orbital solutions for &#954; Dra were derived assuming a circular orbit with a period P = 61d:5549 and K = 6:81 kms-1. We failed to find absorption or emission lines for the unresolved secondary component.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Presentamos un análisis espectroscópico de la estrella Be &#954; Dra. Obtuvimos dos conjuntos de mediciones independientes de velocidades radiales, de manera directa y usando una técnica de separación de líneas. Con la combinación de las soluciones de los códigos FOTEL y KOREL obtuvimos elementos orbitales mejorados. A partir de las mediciones de las líneas de Balmer y de algunas líneas metálicas intensas encontramos que todas las variaciones de la velocidad radial están acopladas en fase al movimiento orbital. Se obtuvieron estas variaciones para las líneas H&#945;, H&#946;, H&#947; y otras líneas fotosféricas, que también resultaron acopladas al movimiento orbital. Detectamos una protuberancia móvil en absorción sobrepuesta a los perfiles en emisión. Las soluciones orbitales para &#954;Dra se obtuvieron asumiendo una órbita circular con un periodo de P = 61d:5549 y con K = 6:81 kms-1. No fue posible detectar las líneas en absorción o emisión de la secundaria no resuelta.]]></p></abstract>
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