Rotation and Nitrogen Enhancements in Blue Supergiants
نویسندگان
چکیده
منابع مشابه
On 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...
متن کاملVlt Spectroscopy of Blue Supergiants in Ic 1613 1
We present multi-object spectroscopy of young, massive stars in the Local Group galaxy IC 1613. We provide the spectral classification and a detailed spectral catalog for 54 OBA stars in this galaxy. The majority of the photometrically selected sample is composed of Band A-type supergiants. The remaining stars include early O-type dwarfs and the only Wolf-Rayet star known in this galaxy. Among ...
متن کاملMetallicities of 4 blue supergiants near the Galactic centre
High resolution optical spectra of four blue super-giants (HD148422 B0.5 Ib; HD178487 B0.5 Ib; HD179407 B1 Ib, HD163522 B1 Ib) which lie within 4.5 kpc of the Galac-tic centre are presented. Careful differential LTE model atmosphere analyses are used to quantify the differences in photo-spheric metal abundances between these stars and MK spectral standards in the solar neighborhood. A detailed ...
متن کاملStellar Lunch Blue Supergiants as distance and stellar metallicity measures in the Local Volume
Rolf Kudritzki and co-workers at the IfA, University of Hawaii (and elsewhere) have, over the past 14 years, been developing techniques to use low resolution spectroscopy of distant B-A supergiants to measure stellar metallicity, surface gravities, reddening and extinction, absolute bolometric magnitudes and distances. With the current 8-10 metre class telescopes the technique permits these mea...
متن کاملCan mass loss and overshooting prevent the excitation of g-modes in blue supergiants?
Thanks to their past history on the main sequence phase, supergiant massive stars develop a convective shell around the helium core. This intermediate convective zone (ICZ) plays an essential role in governing which g-modes are excited. Indeed a strong radiative damping occurs in the high density radiative core but the ICZ acts as a barrier preventing the propagation of some g-modes into the co...
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: Highlights of Astronomy
سال: 2002
ISSN: 1539-2996
DOI: 10.1017/s153929960001354x