Near-IR spectra of red supergiants and giants
نویسندگان
چکیده
منابع مشابه
Near - IR spectra of IPHAS extremely red Galactic AGB stars
We present a library of 139 near-IR spectra of cool asymptotic giant branch stars that will be useful for comparison with theoretical model atmosphere calculations and for modeling the integrated emission from intermediate-age stellar populations. The source list was selected from the “extremely red” region of the INT Photometric Hα Survey (IPHAS) colour-colour plane that is overwhelmingly domi...
متن کاملOn determining the mass - loss rates of red giants and red supergiants based on infrared data
I review existing methods for determining mass-loss rates of red giants and red supergiants based on infrared data. The simplest method is based on models for the absorption and emission by dust which forms in the dense outflows from these cool stars. I discuss the parameters and assumptions upon which the method relies, review relationships between the mass-loss rate and infrared colours or fa...
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 کاملIR spectra of young Magellanic Cloud clusters and starburst galaxies: constraints on the temperature of red supergiants and new estimates of metallicity in young stellar populations
Infrared spectra of young stellar clusters in the Magellanic Clouds are used to derive information on the red supergiants dominating their 1.6 m emission, and to obtain a new and independent estimate of their metallicities. The most striking result is that red supergiants with low metallicity appear to be much cooler than predicted by evolutionary models, and this most probably reflects uncerta...
متن کاملYoung red supergiants and the near infrared light appearance of disk galaxies
Disk galaxies often show prominent nonaxisymmetric features at nearinfrared wavelengths. Such features may indicate variations in the surface density of stellar mass, contributions from young red supergiants in star forming regions, or substantial dust obscuration. To distinguish among these possibilities, we have searched for spatial variations in the 2.3μm photometric CO index within the disk...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20065824