Optical spectroscopy of the low mass X-ray binary GX9+9

Details Optical spectroscopy of the low mass X-ray binary GX9+9 Optical spectroscopy of the low mass X-ray binary GX9+9

2007-07-03

arxiv.org/abs/0707.0449v1

Astronomy and Astrophysics

Astrophysics

12 pages, 11 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12193.x

Phase-resolved medium resolution VLT spectroscopy of the low mass X-ray binary GX9+9 has revealed narrow CIII emission lines that move in phase relative to our new estimate of the ephemeris, and show a velocity amplitude of 230+/-35 km/s. We identify the origin of these lines as coming from the surface of the donor star, thereby providing the first estimate of the mass function of f(M_1)>=0.22M_sun. Rotational broadening estimates together with assumptions for the mass donor give 0.07

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