Abstract:
GK Per, a classical nova of 1901, is thought to undergo variable mass accretion on to a magnetized white dwarf (WD) in an intermediate polar system. We organized a multimission observational campaign in the X-ray and ultraviolet energy ranges during its dwarf nova outburst in 2015 March-April. Comparing data from quiescence and near outburst, we have found that the maximum plasma temperature decreased from about 26 to 16.2-0.4 +0.5 keV. This is consistent with the previously proposed scenario of increase in mass accretion rate while the inner radius of the magnetically disrupted accretion disc shrinks, thereby lowering the shock temperature. A NuSTAR observation also revealed a high-amplitude WD spin modulation of the very hard X-rays with a single-peaked profile, suggesting an obscuration of the lower accretion pole and an extended shock region on the WD surface. The X-ray spectrum of GK Per measured with the Swift X-Ray Telescope varied on time-scales of days and also showed a gradual increase of the soft X-ray flux below 2 keV, accompanied by a decrease of the hard flux above 2 keV. In the Chandra observation with the High Energy Transmission Gratings, we detected prominent emission lines, especially of Ne, Mg and Si, where the ratios of H-like to He-like transition for each element indicate a much lower temperature than the underlying continuum. We suggest that the X-ray emission in the 0.8-2 keV range originates from the magnetospheric boundary. © 2017 The Authors.
Registro:
Documento: |
Artículo
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Título: | Multimission observations of the old nova GK Per during the 2015 outburst |
Autor: | Zemko, P.; Orio, M.; Luna, G.J.M.; Mukai, K.; Evans, P.A.; Bianchini, A. |
Filiación: | Department of Physics and Astronomy, Università di Padova, Vicolo dell' Osservatorio 3, Padova, I-35122, Italy INAF - Osservatorio di Padova, Vicolo dell' Osservatorio 5, I-35122 Padova, Italy Department of Astronomy, University of Wisconsin, 475 N. Charter Str, Madison, WI 53704, United States Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Av. Inte. Güiraldes 2620, Buenos Aires, C1428ZAA, Argentina Instituto de Astronomía y Física del Espacio (IAFE), CONICET-Universidad de Buenos Aires, Av. Inte. Güiraldes 2620, Buenos Aires, C1428ZAA, Argentina CRESST and X-ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, United States Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, United Kingdom
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Palabras clave: | Cataclysmic variables; Novae; Stars: individual: GK Per |
Año: | 2017
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Volumen: | 469
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Número: | 1
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Página de inicio: | 476
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Página de fin: | 491
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DOI: |
http://dx.doi.org/10.1093/mnras/stx851 |
Título revista: | Monthly Notices of the Royal Astronomical Society
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Título revista abreviado: | Mon. Not. R. Astron. Soc.
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ISSN: | 00358711
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CODEN: | MNRAA
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v469_n1_p476_Zemko |
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Citas:
---------- APA ----------
Zemko, P., Orio, M., Luna, G.J.M., Mukai, K., Evans, P.A. & Bianchini, A.
(2017)
. Multimission observations of the old nova GK Per during the 2015 outburst. Monthly Notices of the Royal Astronomical Society, 469(1), 476-491.
http://dx.doi.org/10.1093/mnras/stx851---------- CHICAGO ----------
Zemko, P., Orio, M., Luna, G.J.M., Mukai, K., Evans, P.A., Bianchini, A.
"Multimission observations of the old nova GK Per during the 2015 outburst"
. Monthly Notices of the Royal Astronomical Society 469, no. 1
(2017) : 476-491.
http://dx.doi.org/10.1093/mnras/stx851---------- MLA ----------
Zemko, P., Orio, M., Luna, G.J.M., Mukai, K., Evans, P.A., Bianchini, A.
"Multimission observations of the old nova GK Per during the 2015 outburst"
. Monthly Notices of the Royal Astronomical Society, vol. 469, no. 1, 2017, pp. 476-491.
http://dx.doi.org/10.1093/mnras/stx851---------- VANCOUVER ----------
Zemko, P., Orio, M., Luna, G.J.M., Mukai, K., Evans, P.A., Bianchini, A. Multimission observations of the old nova GK Per during the 2015 outburst. Mon. Not. R. Astron. Soc. 2017;469(1):476-491.
http://dx.doi.org/10.1093/mnras/stx851