KRTIČKA, Jiří a Jiří KUBÁT. Comoving frame models of hot star winds II. Reduction of O star wind mass-loss rates in global models. Astronomy and Astrophysics. EDP Sciences, 2017, roč. 606, October, s. "A31-1"-"A31-12", 12 s. ISSN 1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201730723. |
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@article{1391637, author = {Krtička, Jiří and Kubát, Jiří}, article_number = {October}, doi = {http://dx.doi.org/10.1051/0004-6361/201730723}, keywords = {stars: winds outflows ; stars: mass-loss ; stars: early-type ; hydrodynamics ; radiative transfer}, language = {eng}, issn = {1432-0746}, journal = {Astronomy and Astrophysics}, title = {Comoving frame models of hot star winds II. Reduction of O star wind mass-loss rates in global models}, url = {https://www.aanda.org/articles/aa/abs/2017/10/aa30723-17/aa30723-17.html}, volume = {606}, year = {2017} }
TY - JOUR ID - 1391637 AU - Krtička, Jiří - Kubát, Jiří PY - 2017 TI - Comoving frame models of hot star winds II. Reduction of O star wind mass-loss rates in global models JF - Astronomy and Astrophysics VL - 606 IS - October SP - "A31-1"-"A31-12" EP - "A31-1"-"A31-12" PB - EDP Sciences SN - 14320746 KW - stars: winds outflows KW - stars: mass-loss KW - stars: early-type KW - hydrodynamics KW - radiative transfer UR - https://www.aanda.org/articles/aa/abs/2017/10/aa30723-17/aa30723-17.html N2 - We calculate global (unified) wind models of main-sequence, giant, and supergiant O stars from our Galaxy. The models are calculated by solving hydrodynamic, kinetic equilibrium (also known as NLTE) and comoving frame (CMF) radiative transfer equations from the (nearly) hydrostatic photosphere to the supersonic wind. For given stellar parameters, our models predict the photosphere and wind structure and in particular the wind mass-loss rates without any free parameters. Our predicted mass-loss rates are by a factor of 2–5 lower than the commonly used predictions. A possible cause of the difference is abandoning of the Sobolev approximation for the calculation of the radiative force, because our models agree with predictions of CMF NLTE radiative transfer codes. Our predicted mass-loss rates agree nicely with the mass-loss rates derived from observed near-infrared and X-ray line profiles and are slightly lower than mass-loss rates derived from combined UV and Halpha diagnostics. The empirical mass-loss rate estimates corrected for clumping may therefore be reconciled with theoretical predictions in such a way that the average ratio between individual mass-loss rate estimates is not higher than about 1.6. On the other hand, our predictions are by factor of 4.7 lower than pure Halpha mass-loss rate estimates and can be reconciled with these values only assuming a microclumping factor of at least eight. ER -
KRTIČKA, Jiří a Jiří KUBÁT. Comoving frame models of hot star winds II. Reduction of O star wind mass-loss rates in global models. \textit{Astronomy and Astrophysics}. EDP Sciences, 2017, roč.~606, October, s.~''A31-1''-''A31-12'', 12 s. ISSN~1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201730723.
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