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Three new pulsating sdB stars discovered with SuperWASP

Smalley

Three new pulsating sdB stars discovered with SuperWASP Thumbnail


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Abstract

We present an analysis of three new pulsating subdwarf B stars discovered in the Super Wide Angle Search for Planets archive. Two of the stars, J1938+5609 and J0902-0720, are p-mode pulsators; J1938+5609 shows a pulsation at 231.62 d-1 (P = 373 s; 2681 µHz) with an amplitude of 4 mmag, whereas J0902-0720 pulsates at frequencies 636.74 (P = 136 s; 7370 µHz) and 615.34 d-1 (P = 140 s; 7122 µHz), with amplitudes 7.27 and 1.53 mmag, respectively. The third star, J2344-3427, is a hybrid pulsator with a p-mode frequency at 223.16 d-1 (P = 387 s; 2583?µHz) and a corresponding amplitude of 1.5 mmag, and g modes in the frequency range 8.68–28.56 d-1 (P = 3025–9954 s; 100--331µHz) and amplitudes between 0.76 and 1.17 mmag. Spectroscopic results place J1938+5609 and J2344-3427 among the long-period or hybrid pulsators, suggesting there may be further modes in these stars below our detection limits, with J0902-0720 placed firmly amongst the p-mode pulsators.

Acceptance Date Jan 10, 2017
Publication Date May 1, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 5020 -5032
DOI https://doi.org/10.1093/mnras/stx077
Keywords asteroseismology, techniques, photometric, stars, oscillations, subdwarfs
Publisher URL https://doi.org/10.1093/mnras/stx077

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