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@article{897223, author = {Krtička, Jiří and Kubát, Jiří}, article_location = {Les Ulis Cedex, France}, article_number = {09}, keywords = {stars: winds; stars: mass-loss; stars: early-type; hydrodynamics; radiative transfer}, language = {eng}, issn = {0004-6361}, journal = {Astronomy and Astrophysics}, title = {Comoving frame models of hot star winds I. Test of the Sobolev approximation in the case of pure line transitions}, url = {http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/abs/2010/11/aa14111-10/aa14111-10.html}, volume = {519}, year = {2010} }
TY - JOUR ID - 897223 AU - Krtička, Jiří - Kubát, Jiří PY - 2010 TI - Comoving frame models of hot star winds I. Test of the Sobolev approximation in the case of pure line transitions JF - Astronomy and Astrophysics VL - 519 IS - 09 SP - A-50-1 EP - A-50-1 PB - EDP Sciences SN - 00046361 KW - stars: winds KW - stars: mass-loss KW - stars: early-type KW - hydrodynamics KW - radiative transfer UR - http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/abs/2010/11/aa14111-10/aa14111-10.html N2 - We provide hot star wind models with radiative force calculated using the solution of comoving frame (CMF) radiative transfer equation. The wind models are calculated for the first stars, O stars, and the central stars of planetary nebulae. We show that without line overlaps and with solely thermal line broadening the pure Sobolev approximation provides a reliable estimate of the radiative force even close to the wind sonic point. Consequently, models with the Sobolev line force provide good approximations to solutions obtained with non-Sobolev transfer. Taking line overlaps into account, the radiative force becomes slightly lower, leading to a decrease in the wind mass-loss rate by roughly 40%. Below the sonic point, the CMF line force is significantly lower than the Sobolev one. In the case of pure thermal broadening, this does not influence the mass-loss rate, as the wind mass-loss rate is set in the supersonic part of the wind. However, when additional line broadening is present (e.g., the turbulent one) the region of low CMF line force may extend outwards to the regions where the mass-loss rate is set. This results in a decrease in the wind mass-loss rate. This effect can at least partly explain the low wind mass-loss rates derived from some observational analyses of luminous O stars. ER -
KRTIČKA, Jiří and Jiří KUBÁT. Comoving frame models of hot star winds I. Test of the Sobolev approximation in the case of pure line transitions. Online. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, 2010, vol.~519, No~09, p.~A-50-1, 9 pp. ISSN~0004-6361. [citováno 2024-04-23]
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