Clumps in the stellar wind of Vela X-1

Details Clumps in the stellar wind of Vela X-1 Clumps in the stellar wind of Vela X-1

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1248..169k&link_type=abstract

X-RAY ASTRONOMY 2009; PRESENT STATUS, MULTI-WAVELENGTH APPROACH AND FUTURE PERSPECTIVES: Proceedings of the International Confer

Astronomy and Astrophysics

Astronomy

Stellar Winds, X-Ray Binary Stars, Solar Flares, Neutron Stars, Mass Loss And Stellar Winds, X-Ray Binaries, Flares, Neutron Stars

Scientific paper

We present a detailed analysis of all public available INTEGRAL data of the HMXB pulsar Vela X-1. During the more active phases, Vela X-1 featured bright flares with a maximum intensity of more than 5 Crab, but at the same time also offstates during which the source was undetectable by INTEGRAL/ISGRI [1]. We interpret this behavior as a direct evidence for the strongly structured wind in Vela X-1. To study the flaring behavior, we performed a statistical analysis of the X-ray light curve. The resulting log-normal distributions show that also the mass of the clumps in the stellar wind is indeed log-normally distributed, as the X-ray intensity is a direct tracer of the mass accretion rate and thus also for the mass of the clumps.

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