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@article{827661, author = {Krtička, Jiří and Kubát, Jiří}, article_number = {4}, keywords = {hydrodynamics; stars: early-type; stars: mass-loss; stars: winds; outflows; X-rays: stars}, language = {eng}, issn = {0035-8711}, journal = {Monthly Notices of the Royal Astronomical Society}, title = {NLTE models of line-driven stellar winds III. Influence of X-ray radiation on wind structure of O stars}, url = {http://www3.interscience.wiley.com/journal/122264347/abstract}, volume = {394}, year = {2009} }
TY - JOUR ID - 827661 AU - Krtička, Jiří - Kubát, Jiří PY - 2009 TI - NLTE models of line-driven stellar winds III. Influence of X-ray radiation on wind structure of O stars JF - Monthly Notices of the Royal Astronomical Society VL - 394 IS - 4 SP - 2065 - 2079 EP - 2065 - 2079 SN - 00358711 KW - hydrodynamics KW - stars: early-type KW - stars: mass-loss KW - stars: winds KW - outflows KW - X-rays: stars UR - http://www3.interscience.wiley.com/journal/122264347/abstract N2 - We study the influence of X rays on the wind structure of selected O stars. For this purpose we use our non local thermodynamic equilibrium (NLTE) wind code with inclusion of additional artificial source of X rays, assumed to originate in the wind shocks. We show that the influence of shock X ray emission on wind mass loss rate is relatively small. Wind terminal velocity may be slightly influenced by the presence of strong X ray sources, especially for stars cooler than Teff 35 000 K . We discuss the origin of the Lx/L 10 7 relation. For stars with thick wind this relation can be explained assuming that the cooling time depends on wind density. Stars with optically thin winds exhibiting the weak wind problem display enhanced X ray emission which may be connected with large shock cooling length. We propose that this effect can explain the weak wind problem. Inclusion of X rays leads to a better agreement of the model ionization structure with observations. However, we do not find any significant influence of X rays on P v ionization fraction implying that the presence of X rays cannot explain the P V problem. We study the implications of modified ionization equilibrium due to shock emission on the line transfer in the X ray region. We conclude that the X ray line profiles of helium like ions may be affected by the line absorption within the cool wind. ER -
KRTIČKA, Jiří a Jiří KUBÁT. NLTE models of line-driven stellar winds III. Influence of X-ray radiation on wind structure of O stars. \textit{Monthly Notices of the Royal Astronomical Society}. 2009, roč.~394, č.~4, s.~2065 - 2079. ISSN~0035-8711.
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