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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Kepler observations of the variability in B-type stars
Monthly Notices of the Royal Astronomical Society, Volume 413, No. 4, Year 2011
Notification
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Description
The analysis of the light curves of 48 B-type stars observed by Kepler is presented. Among these are 15 pulsating stars, all of which show low frequencies, characteristic of slowly pulsating B (SPB) stars. Seven of these stars also show a few weak, isolated high frequencies and they could be considered as SPB/β Cephei (β Cep) hybrids. In all cases, the frequency spectra are quite different from what is seen from ground-based observations. We suggest that this is because most of the low frequencies are modes of high degree which are predicted to be unstable in models of mid-B stars. We find that there are non-pulsating stars within the β Cep and SPB instability strips. Apart from the pulsating stars, we can identify stars with frequency groupings similar to what is seen in Be stars but which are not Be stars. The origin of the groupings is not clear, but may be related to rotation. We find periodic variations in other stars which we attribute to proximity effects in binary systems or possibly rotational modulation. We find no evidence for pulsating stars between the cool edge of the SPB and the hot edge of the δ Sct instability strips. None of the stars shows the broad features which can be attributed to stochastically excited modes as recently proposed. Among our sample of B stars are two chemically peculiar stars, one of which is a HgMn star showing rotational modulation in the light curve. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Authors & Co-Authors
Balona, Luis A.
South Africa, Cape Town
South African Astronomical Observatory
Pigulski, Andrzej
Poland, Wroclaw
University of Wroclaw
Cat, Peter De
Belgium, Brussels
Royal Observatory of Belgium
Handler, Gerald
Austria, Vienna
Universität Wien
Gutiérrez-Soto, Juan
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Engelbrecht, Chris A.
South Africa, Johannesburg
University of Johannesburg
Frescura, F. A.M.
South Africa, Johannesburg
University of the Witwatersrand
Briquet, Maryline
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Cuypers, Jan
Belgium, Brussels
Royal Observatory of Belgium
Daszyńska-Daszkiewicz, Jadwiga
Poland, Wroclaw
University of Wroclaw
Degroote, Pieter
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Dukes, R. J.
United States, Charleston
College of Charleston
García, Raphael A.
France, Gif-sur-yvette
Institut de Recherche Sur Les Lois Fondamentales de L'univers
Green, Elizabeth M.
United States, Tucson
The University of Arizona
Heber, Ulrich
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Kawaler, Steven D.
United States, Ames
Iowa State University
Lehmann, Holger
Germany, Camburg
Thüringer Landessternwarte Tautenburg
Leroy, B.
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Molenda-Żakowicz, Joanna
Poland, Wroclaw
University of Wroclaw
Neiner, Coralie
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Noels, A.
Belgium, Liege
Université de Liège
Nuspl, János
United Kingdom, London
Queen Mary University of London
Østensen, Roy H.
Belgium, Leuven
Departement Natuurkunde en Sterrenkunde
Pricopi, D.
Romania, Bucharest
Academia Româna
Roxburgh, I. W.
United Kingdom, London
Queen Mary University of London
Salmon, S.
Belgium, Liege
Université de Liège
Smith, M. A.
United States, Baltimore
Space Telescope Science Institute
Suárez, J. C.
Spain, Granada
Instituto de Astrofísica de Andalucía - Csic
Suran, M. D.
Romania, Bucharest
Academia Româna
Szabó, Róbert
Hungary, Budapest
Magyar Tudomanyos Akademia
Uytterhoeven, Katrienu
France, Gif-sur-yvette
Institut de Recherche Sur Les Lois Fondamentales de L'univers
Christensen-Dalsgaard, S.
Denmark, Aarhus
Aarhus Universitet
Kjeldsen, Henrik
Denmark, Aarhus
Aarhus Universitet
Caldwell, Douglas A.
United States, Moffett Field
Nasa Ames Research Center
Girouard, F. R.
United States, Moffett Field
Nasa Ames Research Center
Sanderfer, D. T.
United States, Moffett Field
Nasa Ames Research Center
Statistics
Citations: 109
Authors: 36
Affiliations: 22
Identifiers
Doi:
10.1111/j.1365-2966.2011.18311.x
ISSN:
00358711
e-ISSN:
13652966