文章基本信息

标题：SuperWASP discovery and SALT confirmation of a semi-detached eclipsing binary that contains a δ Scuti star
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作者：A. J. Norton ; A. J. Norton ; M. E. Lohr 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2016
卷号：587
页码：1-8
DOI：10.1051/0004-6361/201526881
语种：English
出版社：EDP Sciences
摘要：Aims. We searched the SuperWASP archive for objects that display multiply periodic photometric variations. Methods. Specifically we sought evidence for eclipsing binary stars that display a further non-harmonically related signal in their power spectra. Results. The object 1SWASP J050634.16–353648.4 has been identified as a relatively bright (V ~ 11.5) semi-detached eclipsing binary with a 5.104 d orbital period that displays coherent pulsations with a semi-amplitude of 65 mmag at a frequency of 13.45 d-1. Follow-up radial velocity spectroscopy with the Southern African Large Telescope confirmed the binary nature of the system. Using the phoebe code to model the radial velocity curve with the SuperWASP photometry enabled parameters of both stellar components to be determined. This yielded a primary (pulsating) star with a mass of 1.73 ± 0.11 M⊙ and a radius of 2.41 ± 0.06 R⊙, as well as a Roche-lobe filling secondary star with a mass of 0.41 ± 0.03 M⊙ and a radius of 4.21 ± 0.11 R⊙. Conclusions. 1SWASP J050634.16–353648.4 is therefore a bright δ Sct pulsator in a semi-detached eclipsing binary with one of the largest pulsation amplitudes of any such system known. The pulsation constant indicates that the mode is likely a first overtone radial pulsation.
关键词：binaries: eclipsing;stars: variables: delta Scuti