English
norskK2 Campaign 5 observations of pulsating subdwarf B stars: Binaries and super-Nyquist frequencies
Permanent link
https://hdl.handle.net/10037/14731
Date
2017-12-05Type
Journal articleTidsskriftartikkel
Peer reviewed
Abstract
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.
Description
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2018 Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. The version of record Reed, M.D., Armbrecht, E.L., Telting, J.H., Baran, A.S., Østensen, R., Blay, P., ... Jeffery, C.S. (2018). K2 Campaign 5 observations of pulsating subdwarf B stars: Binaries and super-Nyquist frequencies. Monthly notices of the Royal Astronomical Society, 474(4), 5186-5198 is available online at: https://doi.org/10.1093/mnras/stx3133.