MG13 - Talk detail |
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Participant |
Miskovicova, Ivica | |||||||
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Institution |
Dr. Karl Remeis Observatory & ECAP - Sternwartstrasse 7 - Bamberg - Germany - Germany | |||||||
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Session |
SO3 |
Accepted |
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Talk |
Oral abstract |
Title |
Feeding the monster: Wind accretion in Cygnus X-1 | |||||
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Abstract |
Stellar wind in HMXBs is highly structured: dense clumps of low temperatures are embedded in highly ionized material. We present analysis of the focused stellar wind in the hard state of Cygnus X-1 from high-resolution Chandra-HETGS observations at four distinct orbital phases: phi~0, ~0.2, ~0.5 and ~0.75. All light curves but the one at phi~0.5 show strong absorption dips that are believed to be caused by the clumps. We compare the spectral properties between dips and persistent flux: while the H-like and He-like absorption lines reveal the highly photoionized wind, the lines of lower ionization stages visible only in the dip spectra constrain the properties of the clumps. Comparison between different orbital phases allows us to study the complex structure and dynamics of the wind. |
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