<?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>S0185-11012025000100029</article-id>
<article-id pub-id-type="doi">10.22201/ia.01851101p.2025.61.01.03</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[GX 301-2 Pre-Periastron and Apastron Flares with MAXI]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torregrosa]]></surname>
<given-names><![CDATA[Á.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodes-Roca]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torrejón]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sanjurjo-Ferrín]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mihara]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nakajima]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sugizaki]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Alicante Department of Physics, Systems Engineering and Signal Theory ]]></institution>
<addr-line><![CDATA[Alicante ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Alicante University Institute of Physics Applied to Sciences and Technologies ]]></institution>
<addr-line><![CDATA[Alicante ]]></addr-line>
<country>Spain</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Institute of Physical and Chemical Researh MAXI team ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Japan</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Nihon University School of Dentistry ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Japan</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Kanazawa University Science and Engineering ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Japan</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>61</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>47</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012025000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012025000100029&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012025000100029&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The bright high-mass X-ray binary GX 301-2 exhibits two periodic flare episodes along its orbit which are produced when the neutron star is close to the apastron and periastron passages. Time-resolved spectra were extracted and several models applied to describe all of them. The best description was obtained with a blackbody continuum modified by the Fe K-shell absorption edge, absorbed by a large column density on the order of 1023 cm-2 and, if present, a Fe-K&#945; fluorescent emission line. Three of the nine apastron flares were as bright as the pre-periastron flare and two of them coincided with spin-up episodes of the neutron star. This fact points to the presence of a transient disc around the neutron star as it passes through the apastron that increases the accretion process. The size of the emitting region on the neutron star surface showed some variability but quite consistent with a hot spot.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen GX 301-2 presenta dos fulguraciones periódicas que se producen cuando la estrella de neutrones se encuentra cerca de los pasos por el apoastro y el periastro. Se extrajeron los espectros con resolución en fase orbital y la mejor descripción de todos ellos se obtuvo con un continuo de cuerpo negro modificado por el umbral de absorción de la capa K del Fe, absorbido por una gran columna de hidrogeno (1023 cm-2) y, si estaba presente, una línea de emisión fluorescente del Fe K&#945;. Tres de las nueve fulguraciones en el apoastro fueron tan brillantes como la fulguración del preperiastro y dos de ellas coincidieron con episodios de aumento del período de la pulsación de la estrella de neutrones. Este hecho apunta a la presencia de un disco transitorio alrededor del objeto compacto en su paso por el apoastro. El tamaño de la región de emisión indica una mancha caliente en la superficie del objeto compacto.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[pulsars: individual: GX 301-2]]></kwd>
<kwd lng="en"><![CDATA[supergiants]]></kwd>
<kwd lng="en"><![CDATA[X-rays: binaries]]></kwd>
</kwd-group>
</article-meta>
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