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A 2 h periodic variation in the low-mass X-ray binary Ser X-1
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Cornelisse, R., Casares, J., Charles, P. A. and Steeghs, D. (2013) A 2 h periodic variation in the low-mass X-ray binary Ser X-1. Monthly Notices of the Royal Astronomical Society, Volume 432 (Number 2). pp. 1361-1366. doi:10.1093/mnras/stt554 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt554
Abstract
Spectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ≃2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M⊙ neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (≤10°) of Ser X-1.
Item Type: | Journal Article | ||||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||
Publisher: | Oxford University Press | ||||||||||||
ISSN: | 0035-8711 | ||||||||||||
Official Date: | 21 June 2013 | ||||||||||||
Dates: |
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Volume: | Volume 432 | ||||||||||||
Number: | Number 2 | ||||||||||||
Page Range: | pp. 1361-1366 | ||||||||||||
DOI: | 10.1093/mnras/stt554 | ||||||||||||
Status: | Peer Reviewed | ||||||||||||
Publication Status: | Published | ||||||||||||
Access rights to Published version: | Restricted or Subscription Access |
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