Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ncimc..28..533v&link_type=abstract
Il Nuovo Cimento C, vol. 28, Issue 4, p.533
Physics
3
Scientific paper
The afterglow spectrum of GRB 021004 shows a system of blue-shifted absorption lines, indicating the presence of matter moving towards us at discrete velocities in the range from 0 to more than 2000km/s. We propose that these lines are the result of absorption by circumstellar matter, which was ejected by gamma-ray burst progenitor (a massive star) during its evolution. We have simulated the evolution of the circumstellar medium around such a star and find that the evolutionary sequence: main-sequence, Red Supergiant, Wolf-Rayet star can qualitatively reproduce the various absorption lines systems.
Garcia-Segura Guillermo
Langer Norbert
van Marle Allard Jan
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