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A signature of the donor star in the extra-galactic X-ray binary LMC X-2

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Cornelisse, R., Steeghs, D. (Danny), 1972-, Casares, J., Charles, P. A., Shih, I. C., Hynes, R. I. and O'Brien, K.. (2007) A signature of the donor star in the extra-galactic X-ray binary LMC X-2. Monthly Notices of the Royal Astronomical Society, Vol.381 (No.1). pp. 194-200. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2007.12233.x

Abstract

Two nights of phase-resolved medium-resolution Very Large Telescope spectroscopy of the extra-galactic low-mass X-ray binary LMCX-2 have revealed a 0.32 +/- 0.02 d spectroscopic period in the radial velocity curve of the He II lambda 4686 emission line that we interpret as the orbital period. However, similar to previous findings, this radial velocity curve shows a longer term variation that is most likely due to the presence of a precessing accretion disc in LMCX-2. This is strengthened by He II lambda 4686 Doppler maps that show a bright spot that is moving from night to night. Furthermore, we detect narrow emission lines in the Bowen region of LMCX-2, with a velocity of K-em = 351 +/- 28 km s(-1), that we tentatively interpret as coming from the irradiated side of the donor star. Since K-em must be smaller than K-2, this leads to the first upper limit on the mass function of LMCX-2 of f(M-1) >= 0.86 M-circle dot (95 per cent confidence), and the first constraints on its system parameters.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-ray binaries
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Blackwell Publishing
ISSN:	0035-8711
Date:	11 October 2007
Volume:	Vol.381
Number:	No.1
Number of Pages:	7
Page Range:	pp. 194-200
Identification Number:	10.1111/j.1365-2966.2007.12233.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Union (EU), Spain. Ministerio de Ciencia e Innovación (MICINN), Smithsonian Astrophysical Observatory, United States. National Aeronautics and Space Administration (NASA), Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Science and Technology Facilities Council (Great Britain) (STFC)
Grant number:	MEIFT-CT-2005-024685 (EU), AYA2002-03570 (MICINN)
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URI:	http://wrap.warwick.ac.uk/id/eprint/31307