UKIRT IR Spectra of the Microquasar GRS 1915+105 |
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| Authors: | E Harlaftis Vik S Dhillon Alberto J Castro-Tirado |
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| Institution: | 1.Institute of Astronomy and Astrophysics,National Observatory of Athens,Athens,Greece;2.Department of Physics and Astronomy,Univ. of Sheffield,Sheffield,UK;3.Instituto de Astrofísica de Andalucía (IAA-CSIC),Granada,Spain;4.Laboratorio de Astrofísica Espacial y Física Fundamental (LAEFF-INTA),Madrid,Spain |
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| Abstract: | The UKIRT JHK-band spectrum of GRS 1915+105 shows strong He I (2.059μm) and Brγ (2.166 μm) emission lines. Eikenberry etal. (1998) found flux variations of a factor of 5 in these lines on a5 min timescale. Based on the detection or not of the He II emission line,it was suggested that the companion could be a LMXB or a HMXB,respectively. Since the spectral type of the companion star of GRS1915+105 is still an open question we attempt to clarify the issue byrevisiting the object and comparing the JHK spectrum with that of the Bestar DM +49 3718 and the prototype X-ray binary Sco X-1. |
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