<?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>S0185-11012017000200017</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Absolute Nuv Magnitudes of Gaia DR1 Astrometric Stars and a Search for Hot Companions in Nearby Systems]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Makarov]]></surname>
<given-names><![CDATA[Valeri V.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,US Naval Observatory  ]]></institution>
<addr-line><![CDATA[Washington DC]]></addr-line>
<country>USA</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>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012017000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000200017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000200017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Accurate parallaxes from Gaia DR1 (TGAS) are combined with GALEX visual Nuv magnitudes to produce absolute Mnuv magnitudes and an ultraviolet HR diagram for a large sample of astrometric stars. A functional fit is derived of the lower envelope main sequence of the nearest 1403 stars (distance &lt; 40 pc), which should be reddening-free. Using this empirical fit, 50 nearby stars are selected with significant Nuv excess. These are predominantly late K and early M dwarfs, often associated with X-ray sources, and showing other manifestations of magnetic activity. The sample may include systems with hidden white dwarfs, stars younger than the Pleiades, or, most likely, tight interacting binaries of the BY Dra-type. A separate collection of 40 stars with precise trigonometric parallaxes and Nuv&#8722;G colors bluer than 2 mag is presented. It includes several known novae, white dwarfs, and binaries with hot subdwarf (sdOB) components, but most remain unexplored.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se combinan paralajes del Gaia DR1 (TGAS) con magnitudes visuales Nuv del GALEX para obtener magnitudes absolutas Mnuv as´&#305; como un diagrama HR ultravioleta para una muestra de estrellas astrométricas. Se deriva un ajuste para la envolvente inferior de la secuencia principal para las 1403 estrellas con distancias &lt; 40 pc, que no tendrían enrojecimiento. Se seleccionan 50 estrellas cercanas con un exceso Nuv considerable. Estas estrellas son principalmente de tipo K tardío y M temprano, frecuentemente asociadas con fuentes de rayos X, y con otras manifestaciones de actividad magnética. La muestra puede incluir sistemas con enanas blancas ocultas, estrellas más jóvenes que las Pléyades o binarias interactuantes de tipo BY Dra. Se presenta otra muestra de 40 estrellas con paralajes trigonométricas precisas y colores Nuv-G más azules que 2 mag. Esta incluye varias novas, enanas blancas y binarias con subenanas calientes como compañeras.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[binaries: general]]></kwd>
<kwd lng="en"><![CDATA[Hertzsprung-Russell and C-M diagrams]]></kwd>
<kwd lng="en"><![CDATA[stars]]></kwd>
<kwd lng="en"><![CDATA[activity]]></kwd>
<kwd lng="en"><![CDATA[white dwarfs]]></kwd>
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