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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
First Kepler results on compact pulsators - II. KIC-010139564, a new pulsating subdwarf B (V361 Hya) star with an additional low-frequency mode
Monthly Notices of the Royal Astronomical Society, Volume 409, No. 4, Year 2010
Notification
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Description
We present the discovery of non-radial pulsations in a hot subdwarf B star based on 30.5 d of nearly continuous time series photometry using the Kepler spacecraft. KIC-010139564 is found to be a short-period pulsator of the V361-Hya (EC-14026) class with more than 10 independent pulsation modes whose periods range from 130 to 190 s. It also shows one periodicity at a period of 3165 s. If this periodicity is a high-order g-mode, then this star may be the hottest member of the hybrid DW-Lyn stars. In addition to the resolved pulsation frequencies, additional periodic variations in the light curve suggest that a significant number of additional pulsation frequencies may be present. The long duration of the run, the extremely high duty cycle and the well-behaved noise properties allow us to explore the stability of the periodic variations, and to place strong constraints on how many of them are independent stellar oscillation modes. We find that most of the identified periodicities are indeed stable in phase and amplitude, suggesting a rotation period of 2-3 weeks for this star, but further observations are needed to confirm this suspicion. © 2010 The Authors. Monthly Notices of the Royal Astronomical Society © 2010 RAS.
Authors & Co-Authors
Kawaler, Steven D.
United States, Ames
Iowa State University
Reed, Michael D.
United States, Springfield
Missouri State University
Quint, A. C.
United States, Springfield
Missouri State University
Østensen, Roy H.
Belgium, Leuven
Ku Leuven
Silvotti, Roberto
Italy, Rome
Istituto Nazionale Di Astrofisica, Rome
Baran, Andrzej S.
United States, Ames
Iowa State University
Poland, Krakow
Uniwersytet Pedagogiczny Im. Komisji Edukacji Narodowej
Charpinet, Stéphane
France, Paris
Cnrs Centre National de la Recherche Scientifique
Bloemen, Steven
Belgium, Leuven
Ku Leuven
Kurtz, Donald W.
United Kingdom, Preston
University of Central Lancashire
Telting, John H.
Spain, Brena Baja
Nordic Optical Telescope
Handler, Gerald
Austria, Vienna
Universität Wien
Kjeldsen, Henrik
Denmark, Aarhus
Aarhus Universitet
Christensen-Dalsgaard, Joergen
Denmark, Aarhus
Aarhus Universitet
Borucki, William J.
United States, Washington, D.c.
National Aeronautics and Space Administration
Koch, David G.
United States, Washington, D.c.
National Aeronautics and Space Administration
Statistics
Citations: 30
Authors: 15
Affiliations: 11
Identifiers
Doi:
10.1111/j.1365-2966.2010.17528.x
ISSN:
00358711