A Luminous Companion to SGR 1806-20

Details A Luminous Companion to SGR 1806-20 A Luminous Companion to SGR 1806-20

1995-02-07

arxiv.org/abs/astro-ph/9502038v1

Astroph. J. 444, L33 (1995)

Astronomy and Astrophysics

Astrophysics

5 pages, AASTEX text+table and 2 PostScript figures (needs LaTeX style files aaspptwo.sty, epsf.sty and rotate.sty). In case o

Scientific paper

10.1086/187853

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 $\simgt6$ 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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