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SuperWASP discovery and SALT confirmation of a semi-detached eclipsing binary that contains a delta Scuti star

Smalley

SuperWASP discovery and SALT confirmation of a semi-detached eclipsing binary that contains a delta Scuti star Thumbnail


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Abstract

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 d 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.

Acceptance Date Jan 12, 2016
Publication Date Feb 16, 2016
Journal Astronomy & Astrophysics
Print ISSN 0004-6361
Publisher EDP Sciences
DOI https://doi.org/10.1051/0004-6361/201526881
Keywords binaries, eclipsing, stars, variables, delta Scuti
Publisher URL http://dx.doi.org/10.1051/0004-6361/201526881

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