Models for the circumstellar medium of long gamma-ray burst progenitor candidates

Details Models for the circumstellar medium of long gamma-ray burst progenitor candidates Models for the circumstellar medium of long gamma-ray burst progenitor candidates

2006-11-27

arxiv.org/abs/astro-ph/0611812v1

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of: "Circumstellar Media and Late Stages of Massive Stellar Evolution", September 4-8, 2006, Ense

Scientific paper

We present hydrodynamical models of circumstellar medium (CSM) of long gamma-ray burst (GRB) progenitor candidates. These are massive stars that have lost a large amount of mass in the form of stellar wind during their evolution. There are two possible ways to probe the CSM of long GRB progenitors. Firstly, the GRB afterglow consists of synchrotron radiation, emitted when the GRB jet sweeps up the surrounding medium. Therefore, the lightcurve is directly related to the density profile of the CSM. The density can either decrease with the radius squared (as is the case for a freely expanding stellar wind) or be constant (as we would expect for shocked wind or the interstellar medium). Secondly, material between the GRB and the observer will absorb part of the afterglow radiation, causing absorption lines in the afterglow spectrum. In some cases, such absorption lines are blue-shifted relative to the source indicating that the material is moving away from the progenitor star. This can be explained in terms of wind interactions in the CSM. We can use the CSM of these stars to investigate their prior evolutionary stage.

Affiliated with

Also associated with

No associations

Rating

Models for the circumstellar medium of long gamma-ray burst progenitor candidates 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 Models for the circumstellar medium of long gamma-ray burst progenitor candidates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Models for the circumstellar medium of long gamma-ray burst progenitor candidates will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-22919