منابع مشابه
Quantitative Spectral Analysis of Early B-type Supergiants in the Sculptor Galaxy Ngc 300
The spectra of two early B-type supergiant stars in the Sculptor spiral galaxy NGC 300 are analysed by means of non-LTE line blanketed unified model atmospheres, aimed at determining their chemical composition and the fundamental stellar and wind parameters. For the first time a detailed chemical abundance pattern (He, C, N, O, Mg and Si) is obtained for a B-type supergiant beyond the Local Gro...
متن کاملThe 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.
متن کاملPost-red Supergiants
The yellow hypergiants are found in a stage between the massive Red Supergiants and the Wolf-Rayet stars. This review addresses current issues concerning the evolution of massive stars, concentrating on the transitional postRed Supergiant phase. Few yellow hypergiants are known and even fewer show direct evidence for having evolved off the Red Supergiant branch. Indeed, only two such rare objec...
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 کاملRed Supergiants in the Local Group
Galaxies in the Local Group span a factor of 15 in metallicity, ranging from the super-solar M31 to the Wolf-Lundmark-Melotte (WLM) galaxy, which is the lowest-metallicity (0.1Z⊙) Local Group galaxy currently forming stars. Studies of massive star populations across this broad range of environments have revealed important metallicitydependent evolutionary trends, allowing us to test the accurac...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1986
ISSN: 0074-1809
DOI: 10.1017/s0074180900148740