KRTIČKA, Jiří, Achim FELDMEIER, Lida OSKINOVA, Jiří KUBÁT and Wolf-Rainer HAMANN. X-ray emission from hydrodynamical simulations in non-LTE wind models. Astronomy and Astrophysics. Les Ulis Cedex, France: EDP Sciences, 2009, Neuveden, No 508, p. 841-848. ISSN 0004-6361. |
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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 and Wolf-Rainer HAMANN. X-ray emission from hydrodynamical simulations in non-LTE wind models. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, 2009, Neuveden, No~508, p.~841-848. ISSN~0004-6361.
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