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dc.contributor.author
Zemko, P.
dc.contributor.author
Orio, M.
dc.contributor.author
Luna, Gerardo Juan Manuel
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Mukai, K.
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Evans, P. A.
dc.contributor.author
Bianchini, A.
dc.date.available
2017-07-20T19:57:30Z
dc.date.issued
2017-07
dc.identifier.citation
Zemko, P.; Orio, M.; Luna, Gerardo Juan Manuel; Mukai, K.; Evans, P. A.; et al.; Multimission observations of the old nova GK Per during the 2015 outburst; Oxford University Press; Monthly Notices of the Royal Astronomical Society; 469; 1; 7-2017; 476-491
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/21027
dc.description.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 (IP). We organized a multi-mission observational campaign in the X-ray and ultraviolet (UV) energy ranges during its dwarf nova (DN) 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 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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Oxford University Press
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
(Stars:) Novae
dc.subject
Cataclysmic Variables
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Stars: Individual: Gk Per
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
Multimission observations of the old nova GK Per during the 2015 outburst
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-07-11T13:11:46Z
dc.journal.volume
469
dc.journal.number
1
dc.journal.pagination
476-491
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Zemko, P.. Universita Di Padova; Italia
dc.description.fil
Fil: Orio, M.. Universita Di Padova; Italia
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Fil: Luna, Gerardo Juan Manuel. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
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Fil: Mukai, K.. National Aeronautics And Space Administration; Estados Unidos
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Fil: Evans, P. A.. University of Leicester; Reino Unido
dc.description.fil
Fil: Bianchini, A.. Universita Di Padova; Italia
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx851
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stx851
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1705.07707
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