KRTIČKA, Jiří, Jiří KUBÁT a Jan SKALICKÝ. X-Ray Photoionized Bubble in the Wind of Vela X-1 Pulsar Supergiant Companion. Astrophysical Journal. Chicago: University of Chicago Press, 2012, roč. 757, č. 2, s. 162-167. ISSN 0004-637X. Dostupné z: https://dx.doi.org/10.1088/0004-637X/757/2/162. |
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@article{992948, author = {Krtička, Jiří and Kubát, Jiří and Skalický, Jan}, article_location = {Chicago}, article_number = {2}, doi = {http://dx.doi.org/10.1088/0004-637X/757/2/162}, keywords = {hydrodynamics; radiative transfer; stars: early-type; stars: mass-loss; stars: winds; outflows}, language = {eng}, issn = {0004-637X}, journal = {Astrophysical Journal}, title = {X-Ray Photoionized Bubble in the Wind of Vela X-1 Pulsar Supergiant Companion}, url = {http://adsabs.harvard.edu/abs/2012ApJ...757..162K}, volume = {757}, year = {2012} }
TY - JOUR ID - 992948 AU - Krtička, Jiří - Kubát, Jiří - Skalický, Jan PY - 2012 TI - X-Ray Photoionized Bubble in the Wind of Vela X-1 Pulsar Supergiant Companion JF - Astrophysical Journal VL - 757 IS - 2 SP - 162-167 EP - 162-167 PB - University of Chicago Press SN - 0004637X KW - hydrodynamics KW - radiative transfer KW - stars: early-type KW - stars: mass-loss KW - stars: winds KW - outflows UR - http://adsabs.harvard.edu/abs/2012ApJ...757..162K N2 - Vela X-1 is the archetype of high-mass X-ray binaries (HMXBs), composed of a neutron star and a massive B supergiant. The supergiant is a source of a strong radiatively driven stellar wind. The neutron star sweeps up this wind and creates a huge amount of X-rays as a result of energy release during the process of wind accretion. Here, we provide detailed NLTE models of the Vela X-1 envelope. We study how the X-rays photoionize the wind and destroy the ions responsible for the wind acceleration. The resulting decrease of the radiative force explains the observed reduction of the wind terminal velocity in a direction to the neutron star. The X-rays create a distinct photoionized region around the neutron star filled with a stagnating flow. The existence of such photoionized bubbles is a general property of HMXBs. We unveil a new principle governing these complex objects, according to which there is an upper limit to the X-ray luminosity the compact star can have without suspending the wind due to inefficient line driving. ER -
KRTIČKA, Jiří, Jiří KUBÁT a Jan SKALICKÝ. X-Ray Photoionized Bubble in the Wind of Vela X-1 Pulsar Supergiant Companion. \textit{Astrophysical Journal}. Chicago: University of Chicago Press, 2012, roč.~757, č.~2, s.~162-167. ISSN~0004-637X. Dostupné z: https://dx.doi.org/10.1088/0004-637X/757/2/162.
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