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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., 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. doi:10.1111/j.1365-2966.2007.12233.x
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WRAP_Steeghs_Signature_donor_star_0707.2018v1.pdf - Accepted Version Download (490Kb) | Preview |
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: | Wiley | ||||
| ISSN: | 0035-8711 | ||||
| Official Date: | 11 October 2007 | ||||
| Dates: |
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| Date of first compliant deposit: | 14 December 2015 | ||||
| Volume: | Vol.381 | ||||
| Number: | No.1 | ||||
| Number of Pages: | 7 | ||||
| Page Range: | pp. 194-200 | ||||
| DOI: | 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) |
Data sourced from Thomson Reuters' Web of Knowledge
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