| KRTIČKA, Jiří, Achim FELDMEIER, Lida OSKINOVA, Jiří KUBÁT a Wolf-Rainer HAMANN. X-ray emission from hydrodynamical simulations in non-LTE wind models. Astronomy and Astrophysics. Les Ulis Cedex, France: EDP Sciences, Neuveden, č. 508, s. 841-848. ISSN 0004-6361. 2009. |
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@article{859873,
author = {Krtička, Jiří and Feldmeier, Achim and Oskinova, Lida and Kubát, Jiří and Hamann, WolfandRainer},
article_location = {Les Ulis Cedex, France},
article_number = {508},
keywords = {stars: winds; outflows -- stars: mass-loss -- stars: early-type -- hydrodynamics -- X-rays: stars},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
title = {X-ray emission from hydrodynamical simulations in non-LTE wind models},
url = {http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2009/47/aa12642-09/aa12642-09.html},
volume = {Neuveden},
year = {2009}
}
TY - JOUR
ID - 859873
AU - Krtička, Jiří - Feldmeier, Achim - Oskinova, Lida - Kubát, Jiří - Hamann, Wolf-Rainer
PY - 2009
TI - X-ray emission from hydrodynamical simulations in non-LTE wind models
JF - Astronomy and Astrophysics
VL - Neuveden
IS - 508
SP - 841-848
EP - 841-848
PB - EDP Sciences
SN - 00046361
KW - stars: winds
KW - outflows -- stars: mass-loss -- stars: early-type -- hydrodynamics -- X-rays: stars
UR - http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2009/47/aa12642-09/aa12642-09.html
N2 - Hot stars are sources of X-ray emission originating in their winds. Although hydrodynamical simulations that are able to predict this X-ray emission are available, the inclusion of X-rays in stationary wind models is usually based on simplifying approximations. To improve this, we use results from time-dependent hydrodynamical simulations of the line-driven wind instability (seeded by the base perturbation) to derive the analytical approximation of X-ray emission in the stellar wind. We use this approximation in our non-LTE wind models and find that an improved inclusion of X-rays leads to a better agreement between model ionization fractions and those derived from observations. Furthermore, the slope of the LX-L relation is in better agreement with observations, however the X-ray luminosity is underestimated by a factor of three. We propose a possible solution for this discrepancy.
ER -
KRTIČKA, Jiří, Achim FELDMEIER, Lida OSKINOVA, Jiří KUBÁT a Wolf-Rainer HAMANN. X-ray emission from hydrodynamical simulations in non-LTE wind models. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, Neuveden, č.~508, s.~841-848. ISSN~0004-6361. 2009.
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