منابع مشابه
NLTE wind models for SMC stars
We study stellar wind properties of selected late O stars in the Small Magellanic Cloud (SMC). We calculate NLTE line-driven wind models for these stars and compare predicted wind parameters with observed values. We found satisfactory agreement between theoretical and observed terminal velocities. On the other hand, predicted and observed mass-loss rates are in a good agreement only for higher ...
متن کاملRadiation driven wind models for A, F and G supergiants
We investigate the effects of radiation pressure on the atmospheres of A, F and G-supergiants by calculating hydrodynamical model atmospheres for stars with 5500 ≤ Teff ≤ 9500 K. In the subsonic part of the wind, the radiation pressure by continuum and lines from Kurucz (1992) is taken into account. In the supersonic part of the wind, the radiation pressure is expressed in terms of the force mu...
متن کامل<3d> Nlte Line Formation in the Atmospheres of Red Supergiants
Red supergiants with their enormous brightness at J-band are ideal probes of cosmic chemical composition. It is therefore crucial to have realistic models of radiative transfer in their atmospheres, which will permit determination of abundances accurate to 0.15 dex, the precision attainable with future telescope facilities in galaxies as distant as tens of Mpc. Here, we study the effects of non...
متن کاملPhysical Parameters and Wind Properties of Galactic Early B Supergiants
We present optical studies of the physical and wind properties, plus CNO chemical abundances, of 25 O9.5–B3 Galactic supergiants. We employ non-LTE, line blanketed, extended model atmospheres, which provide a modest downward revision in the effective temperature scale of early B supergiants of up to 1–2kK relative to previous non-blanketed results. The so-called ‘bistability jump’ at B1 (Teff ∼...
متن کاملNLTE models of line-driven stellar winds
New numerical models of line-driven stellar winds of late O stars are presented. Statistical equilibrium (NLTE) equations of the most abundant elements are solved. Properly obtained occupation numbers are used to calculate consistent radiative force and radiative heating terms. Wind density, velocity and temperature are calculated as a solution of model hydrodynamical equations. Contrary to oth...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2004
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921304004338