. (2010) First Kepler results on compact pulsators - I. Survey target selection and the first pulsators. Monthly Notices of the Royal Astronomical Society, Vol.409 (No.4). pp. 1470-1486. ISSN 0035-8711

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Abstract

We present results from the first two quarters of a survey to search for pulsations in compact stellar objects with the Kepler spacecraft. The survey sample and the various methods applied in its compilation are described, and spectroscopic observations are presented to separate the objects into accurate classes. From the Kepler photometry we clearly identify nine compact pulsators and a number of interesting binary stars. Of the pulsators, one shows the strong, rapid pulsations typical of a V361 Hya-type sdB variable (sdBV); seven show long-period pulsation characteristics of V1093 Her-type sdBVs; and one shows low-amplitude pulsations with both short and long periods. We derive effective temperatures and surface gravities for all the subdwarf B stars in the sample and demonstrate that below the boundary region where hybrid sdB pulsators are found, all our targets are pulsating. For the stars hotter than this boundary temperature a low fraction of strong pulsators (< 10 per cent) is confirmed. Interestingly, the short-period pulsator also shows a low-amplitude mode in the long-period region, and several of the V1093 Her pulsators show low-amplitude modes in the short-period region, indicating that hybrid behaviour may be common in these stars, also outside the boundary temperature region where hybrid pulsators have hitherto been found.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Double stars, Stellar oscillations, White dwarf stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley-Blackwell Publishing, Inc
ISSN:	0035-8711
Date:	21 December 2010
Volume:	Vol.409
Number:	No.4
Number of Pages:	17
Page Range:	pp. 1470-1486
Identification Number:	10.1111/j.1365-2966.2010.17366.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	United States. National Aeronautics and Space Administration. Science Mission Directorate (SMD), Seventh Framework Programme (European Commission) (FP7), Katholieke Universiteit te Leuven (1970- ), European Research Council (ERC)
Grant number:	227224 (ERC), GOA/2008/04 (KUL)
URI:	http://wrap.warwick.ac.uk/id/eprint/4670

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