ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic Clouds

Details ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic Clouds ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic Clouds

2008-09-12

arxiv.org/abs/0809.2205v1

Astronomy and Astrophysics

Astrophysics

poster IAUS256

Scientific paper

The Large and Small Magellanic Clouds are priviledged environments to perform tests of theoretical predictions at low metallicity on rotational velocities and stellar evolution. According to theoretical predictions, the rotational velocities of B-type stars are expected to be higher in low metallicity (LMC/SMC) than in high metallicity (MW) environments. To verify the models, we observed with the VLT-FLAMES 523 B and Be stars, which form, at the moment, the largest observed sample of these kind of objects in the MCs. We first determined the stellar fundamental parameters and we found that B and Be stars rotate faster in the MCs than in the MW. We also determined the first distribution of the average ZAMS rotational velocities versus the mass of Be stars. These results indicate that the appearance of Be stars is mass-, metallicity-, stellar evolution-, and star-formation regions-dependant. Moreover, the recent models of Long Gamma Ray Bursts progenitors foresee possible LGRBs progenitors at the SMC's metallicity. We confront these models with the observed (ZAMS rotational velocities, masses) distributions of the fastest rotators (Be and Oe stars) in our sample. Furthermore, we compare the corresponding predicted rates from our study with observed rates of LGRBs.

Affiliated with

Also associated with

No associations

Rating

ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic Clouds does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic Clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ZAMS rotational velocities of Be/Oe stars and LGRBs progenitors in the Magellanic Clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-369292