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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 and 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, vol.~394, No~4, p.~2065 - 2079. ISSN~0035-8711.
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