Computer Science
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..60h&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Computer Science
Accretion, Winds, And Outflows
Scientific paper
We present results from our simultaneous observations of the high-mass X-ray binary system Cygnus X-1 / HDE 226868 with Chandra-HETGS, XMM-Newton, Suzaku, RXTE, INTEGRAL, and Swift in 2008 April. The observations have been performed shortly after phase 0 of the 5.6 d orbit when our line of sight to the accreting black hole passes through the densest part of the wind of the donor star.In the context of a consistent description for the 0.5--600 keV spectrum, the high resolution gratings spectra allow us to study the composition and dynamics of the highly photoionized wind. Dense structures in this clumpy O-star wind lead to transient absorption dips in the soft X-ray band. A color-color diagram shows evidence that the additional absorber causing the dips only covers part of the X-ray emitting region. The spectroscopic analysis reveals changes in the ionization state of the wind material between dip and non-dip phases.
Hanke Manfred
Lee Julia C.
Nowak Michael A.
Pottschmidt Katja
Schulz Norbert S.
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