The X-Ray Binary X2127+119 in M15: Evidence for a Very-Low-Mass, Stripped-Giant Companion

((1) Keele University; 2); (2) Oxford University; 3); (3) University of Southampton; (4) Space Telescope Science Institute; 5); (5) University of Exeter; 6); (6) Instituto de Astrofsica de Canarias)

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The X-Ray Binary X2127+119 in M15: Evidence for a Very-Low-Mass, Stripped-Giant Companion

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arxiv astro-ph/0401569 v1 pith:HZQJTKU5 submitted 2004-01-27 astro-ph

L. van Zyl (1 , 2) , P.A. Charles (2 , 3) , S. Arribas (4 , 6) , T. Naylor (1 , 5)

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E. Mediavilla (6) C. Hellier (1) ((1) Keele University (2) Oxford University (3) University of Southampton (4) Space Telescope Science Institute (5) University of Exeter (6) Instituto de Astrofsica de Canarias)

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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.

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