Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-27
Mon.Not.Roy.Astron.Soc. 350 (2004) 649
Astronomy and Astrophysics
Astrophysics
8 pages, 6 figures, accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2004.07676.x
We present integral field spectroscopy of X2127+119, the luminous X-ray binary in the globular cluster M15, obtained with INTEGRAL/WYFFOS on the William Herschel Telescope. We find that tomograms of HeII 4686 line profiles appear to be incompatible with the previously-assumed view of X2127+119, in which the binary consists of a 1.4-solar-mass neutron star and a 0.8-solar-mass sub-giant companion near the main-sequence turn-off for M15. Our data imply a much smaller mass ratio M_2/M_x of 0.1. We find that models of X2127+119 with black-hole compact objects give a poor fit to our data, while a neutron-star compact object is consistent with the data, implying that X2127+119's companion may have a much lower mass (~0.1 solar masses) than previously assumed. As an 0.1-solar-mass main-sequence star would be unable to fill its Roche lobe in a binary with X2127+119's orbital period (17.1 hours), the companion is likely to be the remnant of a significantly more massive star which has had most of its envelope stripped away.
Arribas Santiago
Charles Phil A.
Hellier Coel
Mediavilla Evencio
Naylor Tim
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