The Wind Momentum – Luminosity Relationship of Blue Supergiants
نویسندگان
چکیده
منابع مشابه
The Wind Momentum - Luminosity relationship : blue supergiants in the spiral galaxy NGC 300
We have carried out the wind analysis of six A-type supergiants in NGC 300. The derived Wind Momentum-Luminosity Relationship is compared with that of Galactic and M31 blue supergiants and with theoretical models.
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The Balmer lines of four A Ia-supergiants (spectral type A0 to A3) and fourteen B Ia and Ib-supergiants (spectral type B0 to B3) in the solar neighbourhood are analyzed by means of NLTE unified model atmospheres to determine the properties of their stellar winds, in particular their wind momenta. As in previous work for O-stars (Puls et al. 1996) a tight relationship between stellar wind moment...
متن کاملOn the photometric variability of blue supergiants in NGC 300 and its impact on the Flux-weighted Gravity–Luminosity Relationship
We present a study of the photometric variability of spectroscopically confirmed supergiants in NGC 300, comprising 28 epochs extending over a period of five months. We find 15 clearly photometrically variable blue supergiants in a sample of nearly 70 such stars, showing maximum light amplitudes ranging from Based on observations obtained with the 2.2m ESO/MPI telescope at the European Southern...
متن کاملRotation and the wind momentum–luminosity relation for extragalactic distances
The effects of axial stellar rotation on the wind–momentum relation (WLR) for determining the extragalactic distances are investigated. Despite the fact that the mass loss rates grow quite a lot with rotation, remarkably the effects on the WLR are found to be very small on the average. As an example, for an average orientation angle between the rotation axis and the line of sight, the luminosit...
متن کاملOn The Pulsational Stability of Blue Supergiants
The brightest blue supergiants represent the most massive evolved stars known. They are believed to be in the core helium-burning phase of evolution. To discuss the question of their stability, model interiors of core helium-burning stars with hydrogen-burning shells have been constructed and tested for pulsational instability (15-1000 M0). All models are found to be extremely stable against nu...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1999
ISSN: 0252-9211
DOI: 10.1017/s0252921100072304