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Issue A&A
Volume 373, Number 3, July III 2001
Page(s) L37 - L40
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010771



A&A 373, L37-L40 (2001)
DOI: 10.1051/0004-6361:20010771

Identification of the donor in the X-ray binary GRS 1915+105

J. Greiner1, J. G. Cuby2, M. J. McCaughrean1, A. J. Castro-Tirado3, 4 and R. E. Mennickent5

1  Astrophysikalisches Institut Potsdam, 14482 Potsdam, An der Sternwarte 16, Germany
2  ESO, Alonso de Córdova 3107, Santiago 19, Chile
3  Instituto de Astrofísica de Andalucía, (IAA-CSIC), PO Box 03004, 18080 Granada, Spain
4  Laboratorio de Astrofísica Espacial y Física Fundamental (LAEFF-INTA), PO Box 50727, 208080 Madrid, Spain
5  Universidad de Concepción, Casilla 160-C Concepción, Chile

(Received 14 May 2001 / Accepted 26 May 2001 )

Abstract
We report on the results of medium-resolution spectroscopy of GRS 1915+105 in the near-infrared H and K band using the 8 m VLT at ESO. We clearly identify absorption bandheads from 12CO and 13CO. Together with other features this results in a classification of the mass-donating star in this binary as a K-M III star, clearly indicating that GRS 1915+105 belongs to the class of low-mass X-ray binaries (LMXB).


Key words: stars: binaries -- infrared: stars -- stars: individual: GRS 1915+105

Offprint request: J. Greiner, jgreiner@aip.de

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© ESO 2001


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