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Title:
A luminous companion to SGR 1806-20
Authors:
van Kerkwijk, M. H.; Kulkarni, S. R.; Matthews, K.; Neugebauer, G.
Affiliation:
AA(California Institute of Technology, Pasadena, CA, US), AB(California Institute of Technology, Pasadena, CA, US), AC(California Institute of Technology, Pasadena, CA, US), AD(California Institute of Technology, Pasadena, CA, US)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 444, no. 1, p. L33-L35 (ApJL Homepage)
Publication Date:
05/1995
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
Companion Stars, Gamma Ray Bursts, Infrared Spectra, Line Spectra, Stellar Envelopes, Stellar Luminosity, Stellar Winds, Color, Interstellar Extinction, Red Shift, Spectrum Analysis, Stellar Spectrophotometry
DOI:
10.1086/187853
Bibliographic Code:
1995ApJ...444L..33V

Abstract

We have obtained infrared spectra of the star suggested to be the counterpart of the soft gamma-ray repeater (SGR) 1806-20. We found strong emission lines similar to those seen in the spectra of the rare luminous blue variables and B(e) stars. A He I absorption line is also seen, from which we infer a spectral type O9-B2. This classification, in combination with the minimum distance of greater than or approximately = 6 kpc inferred from its extinction, makes the star one of the most luminous in the Galaxy. We infer that it is a companion to SGR 1806-20 and suggest that the presence of a companion is somehow related to the SGR phenomenon.

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