Multimission observations of the old nova GK Per during the 2015 outburst

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. Compa...

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Detalles Bibliográficos
Autor principal: Luna, Gerardo Juan Manuel
Publicado: 2017
Materias:
Cataclysmic variables
Novae
Stars: individual: GK Per
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v469_n1_p476_Zemko
http://hdl.handle.net/20.500.12110/paper_00358711_v469_n1_p476_Zemko
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_00358711_v469_n1_p476_Zemko2023-06-08T15:01:44Z Multimission observations of the old nova GK Per during the 2015 outburst Luna, Gerardo Juan Manuel Cataclysmic variables Novae Stars: individual: GK Per 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. Fil:Luna, G.J.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v469_n1_p476_Zemko http://hdl.handle.net/20.500.12110/paper_00358711_v469_n1_p476_Zemko
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cataclysmic variables
Novae
Stars: individual: GK Per
spellingShingle Cataclysmic variables
Novae
Stars: individual: GK Per
Luna, Gerardo Juan Manuel
Multimission observations of the old nova GK Per during the 2015 outburst
topic_facet Cataclysmic variables
Novae
Stars: individual: GK Per
description 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.
author Luna, Gerardo Juan Manuel
author_facet Luna, Gerardo Juan Manuel
author_sort Luna, Gerardo Juan Manuel
title Multimission observations of the old nova GK Per during the 2015 outburst
title_short Multimission observations of the old nova GK Per during the 2015 outburst
title_full Multimission observations of the old nova GK Per during the 2015 outburst
title_fullStr Multimission observations of the old nova GK Per during the 2015 outburst
title_full_unstemmed Multimission observations of the old nova GK Per during the 2015 outburst
title_sort multimission observations of the old nova gk per during the 2015 outburst
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00358711_v469_n1_p476_Zemko
http://hdl.handle.net/20.500.12110/paper_00358711_v469_n1_p476_Zemko
work_keys_str_mv AT lunagerardojuanmanuel multimissionobservationsoftheoldnovagkperduringthe2015outburst
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