<?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>S0185-11012022000100155</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2022.58.01.12</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Czev502 - An M Dwarf Near the Leo Triplet With Very Strong Flares]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Li&#353;ka]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hudec]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
<xref ref-type="aff" rid="A a"/>
<xref ref-type="aff" rid="A5"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mikulá&#353;ek]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zejda]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Janík]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[&#352;trobl]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Brno University of Technology Central European Institute of Technology ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Czech Republic</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Czech Astronomical Society Variable Star and Exoplanet Section ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Czech Republic</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Academy of Sciences of the Czech Republic Astronomical Institute ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Czech Republic</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Czech Technical University in Prague Faculty of Electrical Engineering ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Czech Republic</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Kazan Federal University  ]]></institution>
<addr-line><![CDATA[Kazan ]]></addr-line>
<country>Russian Federation</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Masaryk University Department of Theoretical Physics and Astrophysics ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Czech Republic</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>58</volume>
<numero>1</numero>
<fpage>155</fpage>
<lpage>168</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012022000100155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012022000100155&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012022000100155&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Discovery of fares in the M dwarf CzeV502 and our follow-up results are presented. We classify it as a dMe eruptive variable of UV Ceti type due to the X-ray activity, measured B -V of 1.5 mag, H&#945; emission, and fares. Our monitoring revealed only one reliable and one suspected superflare in 58 nights (210 hrs). The strongest are with &#916;R = 1:5 mag (&#916;B &#8776;6-8 mag) could have a total energy of 3E+34 erg. The ASAS-SN data may contain 4 events up to &#916;V of 0.43 mag and 12.55 d periodicity corresponding to the rotation or possible binarity. Other brightenings in sky survey (ASAS-3, CRTS, NSVS, and KWS) are doubtful. No event was unveiled on the 1 600 photographic plates. The upper rate limit of 1-2 superares/1 640 hrs corresponds to activity several orders higher than for other M-dwarfs, especially, for the slow rotators. The low amplitude ares (&#916;B &lt; 0:5 mag) may be common (1 are/4 hrs).]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Presentamos nuestro descubrimiento de ráfagas en CzeV502, una enana tipo M, así como resultados subsecuentes. Clasificamos a CzeV502 como una variable eruptiva dMe de tipo UV Ceti debido a su actividad en rayos X, su emisión B-V de 1.5 mag, su emisión en H&#945;, y sus ráfagas. Observamos sólo una ráfaga confiable y una posible superráfaga en 58 noches (210 hrs). La ráfaga más intensa, con &#916;R = 1:5 mag (&#916;B &#8776; 6-8 mag), pudo tener una energía total de 3E+34 erg. Los datos del ASAS-SN pueden contener 4 eventos hasta de &#916;V of 0.43 mag y una periodicidad de 12.55 d, que corresponde a rotación o a posible binariedad. Los datos de ASAS-3, CRTS, NSVS, y KWS son dudosos. No se encontró evento alguno en 1600 placas fotográficas. El límite superior de 1-2 superráfagas /1 640 hrs implica una actividad de _ordenes de magnitud mayor que la de otras enanas M. Las ráfagas de baja amplitud (&#916;B &lt; 0:5 mag) pueden ser frecuentes (1 ráfaga/4 hrs).]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[surveys]]></kwd>
</kwd-group>
</article-meta>
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