Multiwavelength Observations of EXO 0748–676. II. Emission-Line Behavior

K. J. Pearson; R. I. Hynes; D. Steeghs; P. G. Jonker; C. A. Haswell; A. R. King; K. O’Brien; G. Nelemans; M. Méndez

doi:10.1086/506191

Multiwavelength Observations of EXO 0748–676. II. Emission-Line Behavior

K. J. Pearson¹, R. I. Hynes¹, D. Steeghs², P. G. Jonker^3,4,5, C. A. Haswell⁶, A. R. King⁷, K. O'Brien⁸, G. Nelemans⁹, and M. Méndez³

© 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 648, Number 2 Citation K. J. Pearson et al 2006 ApJ 648 1169 DOI 10.1086/506191

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Author affiliations

¹ Department of Physics and Astronomy, 202 Nicholson Hall, Louisiana State University, Baton Rouge, LA 70803

² Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 67, Cambridge, MA 02138

³ SRON-National Institute for Space Research, Sorbonnelaan 2, 3584 CA, Utrecht, Netherlands

⁴ Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 83, Cambridge, MA 02138

⁵ Astronomical Institute, Utrecht University, P.O. Box 80000, 3508 TA, Utrecht, Netherlands

⁶ Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK

⁷ Department of Physics and Astronomy, The University of Leicester, University Road, Leicester, LE1 7RH, UK

⁸ European Southern Observatory, Casilla 19001, Santiago 19, Chile

⁹ Department of Astrophysics, Radboud University, P.O. Box 9010, 6500 GL, Nijmegen, Netherlands

Dates

Received 2006 February 8
Accepted 2006 May 23

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Abstract

We present optical and ultraviolet spectra, light curves, and Doppler tomograms of the low-mass X-ray binary EXO 0748-676. Using an extensive set of 15 emission-line tomograms, we show that, along with the usual emission from the stream and "hot spot," there is extended nonaxisymmetric emission from the disk rim. Some of the emission and Hα and Hβ absorption features lend weight to the hypothesis that part of the stream overflows the disk rim and forms a two phase medium. The data are consistent with a 1.35 M_☉ neutron star with a main-sequence companion and hence a mass ratio q ≈ 0.34.

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