K2 Campaign 5 observations of pulsating subdwarf B stars: binaries and super-Nyquist frequencies

Bibcode
2018MNRAS.474.5186R
DOI
10.1093/mnras/stx3133
Reed, M. D.; Armbrecht, E. L.; Telting, J. H.; Baran, A. S.; Østensen, R. H.; Blay, P.; Kvammen, A.; Kuutma, Teet; Pursimo, T.; Ketzer, L.; Jeffery, C. S.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 4, p.5186-5198

Advertised on:
3
2018
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
11
IAC number of authors
1
Citations
11
Refereed citations
11
Description
We report the discovery of three pulsating subdwarf B stars in binary systems observed with the Kepler space telescope during Campaign 5 of K2. EPIC 211696659 (SDSS J083603.98+155216.4) is a g-mode pulsator with a white dwarf companion and a binary period of 3.16 d. EPICs 211823779 (SDSS J082003.35+173914.2) and 211938328 (LB 378) are both p-mode pulsators with main-sequence F companions. The orbit of EPIC 211938328 is long (635 ± 146 d) while we cannot constrain that of EPIC 211823779. The p modes are near the Nyquist frequency and so we investigate ways to discriminate super- from sub-Nyquist frequencies. We search for rotationally induced frequency multiplets and all three stars appear to be slow rotators with EPIC 211696659 subsynchronous to its orbit.
Type
Refereed

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