| KRTIČKA, Jiří, Achim FELDMEIER, Lidia OSKINOVA, Jiří KUBÁT a Wolf-Rainer HAMANN. X-ray emission from hydrodynamical wind simulations in non-LTE models. In Coralie Neiner, Gregg Wade, Georges Meynet, Geraldine Peters. Active OB stars: structure, evolution, mass loss, and critical limits. Cambridge: Cambridge University Press, 2011, s. 614-615. ISBN 978-0-521-19840-0. Dostupné z: https://dx.doi.org/10.1017/S1743921311011562. |
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@inproceedings{953272,
author = {Krtička, Jiří and Feldmeier, Achim and Oskinova, Lidia and Kubát, Jiří and Hamann, WolfandRainer},
address = {Cambridge},
booktitle = {Active OB stars: structure, evolution, mass loss, and critical limits},
doi = {http://dx.doi.org/10.1017/S1743921311011562},
editor = {Coralie Neiner, Gregg Wade, Georges Meynet, Geraldine Peters},
keywords = {stars: winds; outflows; stars: early-type; hydrodynamics; X-rays: stars},
language = {eng},
location = {Cambridge},
isbn = {978-0-521-19840-0},
pages = {614-615},
publisher = {Cambridge University Press},
title = {X-ray emission from hydrodynamical wind simulations in non-LTE models},
url = {http://adsabs.harvard.edu/abs/2011IAUS..272..614K},
year = {2011}
}
TY - JOUR
ID - 953272
AU - Krtička, Jiří - Feldmeier, Achim - Oskinova, Lidia - Kubát, Jiří - Hamann, Wolf-Rainer
PY - 2011
TI - X-ray emission from hydrodynamical wind simulations in non-LTE models
PB - Cambridge University Press
CY - Cambridge
SN - 9780521198400
KW - stars: winds
KW - outflows
KW - stars: early-type
KW - hydrodynamics
KW - X-rays: stars
UR - http://adsabs.harvard.edu/abs/2011IAUS..272..614K
L2 - http://adsabs.harvard.edu/abs/2011IAUS..272..614K
N2 - Massive hot stars are strong sources of X-ray emission originating in their winds. Although hydrodynamical wind 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 crude approximations. To improve this, we use results from time-dependent hydrodynamical simulations of the line-driven wind instability to derive an 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, albeit the X-ray luminosity is underestimated by a factor of three. We propose that a possible solution for this discrepancy is connected with the wind porosity.
ER -
KRTIČKA, Jiří, Achim FELDMEIER, Lidia OSKINOVA, Jiří KUBÁT a Wolf-Rainer HAMANN. X-ray emission from hydrodynamical wind simulations in non-LTE models. In Coralie Neiner, Gregg Wade, Georges Meynet, Geraldine Peters. \textit{Active OB stars: structure, evolution, mass loss, and critical limits}. Cambridge: Cambridge University Press, 2011, s.~614-615. ISBN~978-0-521-19840-0. Dostupné z: https://dx.doi.org/10.1017/S1743921311011562.
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