The origin of blue-shifted absorption lines in a gamma-ray burst afterglow

van Marle, A. J. and Langer, N. and Garca'ia-Segura, G. (2005) The origin of blue-shifted absorption lines in a gamma-ray burst afterglow. Il nuovo cimento C, 28 (4\5). pp. 533-536. ISSN 1826-9885

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The afterglow spectrum of GRB 021004 shows a system of blueshifted absorption lines, indicating the presence of matter moving towards us at discrete velocities in the range from 0 to more than 2000 km/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.

Item Type: Article
Additional Information: Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004.
Uncontrolled Keywords: Circumstellar shells, clouds, and expanding envelopes; circumstellar masers ; Mass loss and stellar winds ; Emission-line stars (Of, Be, Luminous Blue Variables,Wolf-Rayet, etc.) ; γ-ray sources; γ-ray bursts
Subjects: 500 Scienze naturali e Matematica > 520 Astronomia e scienze connesse
Depositing User: Marina Spanti
Date Deposited: 16 Mar 2020 17:00
Last Modified: 16 Mar 2020 17:00

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