منابع مشابه
<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 کاملExact results in modeling planetary atmospheres–I. Gray atmospheres
An exact model is proposed for a gray, isotropically scattering planetary atmosphere in radiative equilibrium. The slab is illuminated on one side by a collimated beam and is bounded on the other side by an emitting and partially reflecting ground. We provide expressions for the incident and reflected fluxes on both boundary surfaces, as well as the temperature of the ground and the temperature...
متن کاملresearch publications and other research outputs The population of OB supergiants in the starburst
Context. After leaving the main sequence, massive stars undergo complex evolution, which is still poorly understood. With a population of hundreds of OB stars, the starburst cluster Westerlund 1 offers an unparallelled environment to study their evolutionary tracks. Aims. We characterise a large sample of evolved OB stars in the cluster, with the aim of determining cluster parameters and place ...
متن کاملThe population of OB supergiants in the starburst cluster Westerlund 1
Context. After leaving the main sequence, massive stars undergo complex evolution, which is still poorly understood. With a population of hundreds of OB stars, the starburst cluster Westerlund 1 offers an unparallelled environment to study their evolutionary tracks. Aims. We characterise a large sample of evolved OB stars in the cluster, with the aim of determining cluster parameters and place ...
متن کاملLarge-scale wind structures in OB supergiants: a search for rotationally modulated Hα variability
We present the results of a long-term monitoring campaign of the Hα line in a sample of bright OB-supergiants (O7.5–B9) that aims at detecting rotationally modulated changes potentially related to the existence of large-scale wind structures. A total of 22 objects were monitored during 36 nights spread over 6 months in 2001–2002. Coordinated broad-band photometric observations were also obtaine...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1968
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/141.2.219