Please use this identifier to cite or link to this item:
http://hdl.handle.net/20.500.12386/28733
Title: | SXP 7.92: a recently rediscovered Be/X-ray binary in the Small Magellanic Cloud, viewed edge on | Authors: | Bartlett, E. S. Coe, M. J. ISRAEL, Gian Luca Clark, J. S. Esposito, P. D'Elia, V. Udalski, A. |
Issue Date: | 2017 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 466 | Issue: | 4 | First Page: | 4659 | Abstract: | We present a detailed optical and X-ray study of the 2013 outburst of the Small Magellanic Cloud Be/X-ray binary SXP 7.92, as well as an overview of the last 18 years of observations from OGLE (Optical Gravitational Lensing Experiment), RXTE, Chandra and XMM-Newton. We revise the position of this source to RA(J2000) = 00:57:58.4, Dec(J2000) = -72:22:29.5 with a 1σ uncertainty of 1.5 arcsec, correcting the previously reported position by Coe et al. by more than 20 arcmin. We identify and spectrally classify the correct counterpart as a B1Ve star. The optical spectrum is distinguished by an uncharacteristically deep narrow Balmer series, with the Hα line in particular having a distinctive shell profile, I.e. a deep absorption core embedded in an emission line. We interpret this as evidence that we are viewing the system edge on and are seeing self-obscuration of the circumstellar disc. We derive an optical period for the system of 40.0 ± 0.3 d, which we interpret as the orbital period, and present several mechanisms to describe the X-ray/optical behaviour in the recent outburst, in particular the 'flares'and 'dips' seen in the optical light curve, including a transient accretion disc and an elongated precessing disc. | URI: | http://hdl.handle.net/20.500.12386/28733 | URL: | https://academic.oup.com/mnras/article/466/4/4659/2893461 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stx032 | Bibcode ADS: | 2017MNRAS.466.4659B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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SXP7.92s.pdf | PDF editoriale | 3.4 MB | Adobe PDF | View/Open |
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