Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-03-12
AIP Conf.Proc.1010:269-271,2008
Astronomy and Astrophysics
Astrophysics
3 pages, A Population Explosion: The Nature and Evolution of X-ray Binaries in Diverse Environments
Scientific paper
10.1063/1.2945056
Quantitative constraints on the wind clumping of massive stars can be obtained from the study of the hard X-ray variability of SFXTs. In these systems, a large fraction of the hard X-ray emission is emitted in the form of flares with typical duration of 3 ksec, frequency of 7 days and luminosity of $10^{36}$ ergs/s. Such flares are most probably emitted by the interaction of a compact object orbiting at $\sim10$ R$_*$ with wind clumps ($10^{22-23}$ g). The density ratio between the clumps and the inter-clump medium is $10^{2-4}$ . The parameters of the clumps and of the inter-clump medium are in good agreement with macro-clumping scenario and line-driven instability simulations.
Walter Robert
Zurita-Heras J.
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