Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59.1227n&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.59, No.6, pp.1227--1233
Physics
5
Accretion, Accretion Disks, Black Hole Physics, Stars: Winds, Outflows, X-Rays: Stars
Scientific paper
We examined the observational appearance of highly optically thick winds from supercritical accretion disks, while especially focusing on the shape of a ``photosphere'' of the wind. When a massive wind blows from an accretion disk, the optical depth of the wind may exceed unity in the place, which is higher than the scale height of the disk. If such a wind is realized, the observed light may have originated from the photosphere of the wind, rather than from the disk surface. We calculated the apparent surface of the photosphere, where the observed optical depth is unity, and compared it with the geometry of the accretion disk. We found that the wind photosphere can expand over the disk scale-height for super-Eddington mass-loss rates, but the location and appearance of the photosphere strongly depend on the inclination angle as well as the mass-loss rate. This fact may affect on the interpretation of light curves in galactic eclipsing binaries and recently well-observed ultraluminous X-ray sources.
Fukue Jun
Nishiyama Shinji
Watarai Ken-ya
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