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Influence of Compton scattering on the broad-band X-ray spectra of intermediate polars

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dc.contributor.author Suleimanov V.
dc.contributor.author Poutanen J.
dc.contributor.author Falanga M.
dc.contributor.author Werner K.
dc.date.accessioned 2018-09-18T20:01:34Z
dc.date.available 2018-09-18T20:01:34Z
dc.date.issued 2008
dc.identifier.issn 0004-6361
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/135846
dc.description.abstract Context. The majority of cataclysmic variables observed in the hard X-ray energy band are intermediate polars where the magnetic field is strong enough to channel the accreting matter to the magnetic poles of the white dwarf. A shock above the stellar surface heats the gas to fairly high temperatures (10-100 keV). The post-shock region cools mostly via optically thin bremsstrahlung.Aims. We investigate the influence of Compton scattering on the structure and the emergent spectrum of the post-shock region. We also study the effect it has on the mass of the white dwarfs obtained from fitting the observed X-ray spectrum of intermediate polars. Methods. We construct the model of the post-shock region taking Compton scattering into account. The radiation transfer equation is solved in the plane-parallel approximation. The feedback of Compton scattering on the structure of the post-shock region is also accounted for. A set of the post-shock region model spectra for various white dwarf masses is calculated.Results. We find that Compton scattering does not change the emergent spectra significantly for low accretion rates or low white dwarf masses. However, it becomes important at high accretion rates and high white dwarf masses. The time-averaged, broad-band X-ray spectrum of intermediate polar V709 Cas obtained by the RXTE and and INTEGRAL observatories is fitted using the set of computed spectral models. We obtained the white dwarf mass of 0.90 ± 0.02 M⊙ and 0.88 ± 0.02 M⊙ using models with Compton scattering taken into account and without it, respectively. © 2008 ESO.
dc.relation.ispartofseries Astronomy and Astrophysics
dc.subject Radiative transfer
dc.subject Scattering
dc.subject Stars: atmospheres
dc.subject Stars: binaries: close
dc.subject Stars: novae, cataclysmic variables
dc.subject Stars: white dwarfs
dc.title Influence of Compton scattering on the broad-band X-ray spectra of intermediate polars
dc.type Article
dc.relation.ispartofseries-issue 2
dc.relation.ispartofseries-volume 491
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 525
dc.source.id SCOPUS00046361-2008-491-2-SID57049091215


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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