Norton, AJ, Lohr, ME, Smalley, B, Wheatley, PJ and West, RG (2016) SuperWASP discovery and SALT confirmation of a semi-detached eclipsing binary that contains a delta Scuti star. Astronomy & Astrophysics, 587. ISSN 0004-6361

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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.

Item Type: Article
Additional Information: © The Authors, EDP Sciences
Uncontrolled Keywords: binaries, eclipsing, stars, variables, delta Scuti
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 15 Jun 2016 09:48
Last Modified: 15 Apr 2019 14:13

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