Title: At Last—A V777 Her Pulsator in the Kepler Field
Authors: Ostensen, Roy ×
Bloemen, Steven
Vuckovic, M
Aerts, Conny
Oreiro, R
Kinemuchi, K
Still, M
Koester, D #
Issue Date: Aug-2011
Publisher: I O P Publishing Ltd.
Series Title: The Astrophysical Journal. Letters vol:736 issue:2 pages:-
Article number: L39
Abstract: We present the discovery of the first-and so far the only-pulsating white dwarf star located in the field of view of the Kepler spacecraft. During our ongoing effort to search for compact pulsator candidates that can benefit from the near-continuous coverage of Kepler, we recently identified a faint DB star from spectroscopy obtained with the William Herschel Telescope. After establishing its physical parameters to be T-eff = 24,950 K and log g = 7.91 dex, placing it right in the middle of the V777 Her instability strip, we immediately submitted the target for follow-up space observations. The Kepler light curve reveals a pulsation spectrum consisting of five modes that follow a sequence roughly equally spaced in period with a mean spacing of 37 s. The three strongest modes show a triplet structure with a mean splitting of 3.3 mu Hz. We conclude that this object is a V777 Her pulsator with a mass of similar to 0.56 M-circle dot, and very similar to the class prototype.
ISSN: 2041-8205
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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