منابع مشابه
Pulsations in hot supergiants
Massive stars are the cosmic engines that shape and drive our Universe. Many issues such as their formation, their stability and the mass loss effects, are far from being completely understood. Recent ground-based and space observations have shown pulsations in massive MS and post-MS stars, such as acoustic and gravity modes excited by the κ-mechanism and even solar-like oscillations. Theoretic...
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 کاملThe Physical Properties of Red Supergiants
Red supergiants (RSGs) are a He-burning phase in the evolution of moderately massive stars (10-25M⊙). For many years, the assumed physical properties of these stars placed them at odds with the predictions of evolutionary theory. We have recently determined new effective temperatures and luminosities for the RSG populations of galaxies with a factor of ∼8 range in metallicity, including the Mil...
متن کاملThe spin-up of contracting red supergiants
We report on a mechanism which may lead to a spinup of the surface of a rotating single star leaving the Hayashi line, which is much stronger than the spin-up expected from the mere contraction of the star. By analyzing rigidly rotating, convective stellar envelopes, we qualitatively work out the mechanism through which these envelopes may be spun up or down by mass loss through their lower or ...
متن کاملPulsations in red supergiants with high L/M ratio Implications for the stellar and circumstellar structure of supernova progenitors
We investigate the pulsational properties of RSG models – which we evolve from ZAMS masses in the range 10 to 20M – by means of linear and non-linear calculations. We find period and growth rate of the dominant fundamental mode to increase with increasing luminosity-to-mass ratio L/M . Our models obtain relatively large L/M values due to the inclusion of rotation in the evolutionary calculation...
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ژورنال
عنوان ژورنال: Astronomy Letters
سال: 2012
ISSN: 1063-7737,1562-6873
DOI: 10.1134/s1063773712040032