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Period decrease in three SuperWASP eclipsing binary candidates near the short-period limit
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Lohr, M. E., Norton, A. J., Kolb, U. C., Anderson, D. R., Faedi, Francesca and West, Richard G. (2012) Period decrease in three SuperWASP eclipsing binary candidates near the short-period limit. Astronomy & Astrophysics, Volume 542 . Article number A124. doi:10.1051/0004-6361/201219158 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/201219158
Abstract
SuperWASP light curves for 53 W UMa-type eclipsing binary (EB) candidates, identified in previous work as being close to the contact binary short-period limit, were studied for evidence of period change. The orbital periods of most of the stars were confirmed, and period decrease, significant at more than 5σ, was observed in three objects: 1SWASP J174310.98+432709.6 (−0.055 ± 0.003 s yr-1), 1SWASP J133105.91+121538.0 (−0.075 ± 0.013 s yr-1) and 1SWASP J234401.81−212229.1 (−0.313 ± 0.019 s yr-1). The magnitudes of the observed period changes cannot be explained by magnetic braking or gravitational radiation effects, and are most likely primarily due to unstable mass transfer from primary to secondary components, possibly accompanied by unstable mass and angular momentum loss from the systems. If these period decreases persist, the systems could merge on a relatively short timescale.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | June 2012 | ||||
Dates: |
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Volume: | Volume 542 | ||||
Article Number: | Article number A124 | ||||
DOI: | 10.1051/0004-6361/201219158 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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