The Kepler characterization of the variability among A- and F-type stars I. General overview
Article
Uytterhoeven, K., Moya, A., Grigahcene, A., Guzik, J. A., Gutierrez-Soto, J., Smalley, B., Handler, G., Balona, L. A., Niemczura, E., Fox Machado, L., Benatti, S., Chapellier, E., Tkachenko, A., Szabo, R., Suarez, J. C., Ripepi, V., Pascual, J., Mathias, P., Martin-Ruiz, S., ..., Van Cleve, J.. 2011. "The Kepler characterization of the variability among A- and F-type stars I. General overview." Astronomy and Astrophysics: a European journal. 534. https://doi.org/10.1051/0004-6361/201117368
| Article Title | The Kepler characterization of the variability among A- and F-type stars I. General overview |
|---|---|
| ERA Journal ID | 1050 |
| Article Category | Article |
| Authors | Uytterhoeven, K. (Author), Moya, A. (Author), Grigahcene, A. (Author), Guzik, J. A. (Author), Gutierrez-Soto, J. (Author), Smalley, B. (Author), Handler, G. (Author), Balona, L. A. (Author), Niemczura, E. (Author), Fox Machado, L. (Author), Benatti, S. (Author), Chapellier, E. (Author), Tkachenko, A. (Author), Szabo, R. (Author), Suarez, J. C. (Author), Ripepi, V. (Author), Pascual, J. (Author), Mathias, P. (Author), Martin-Ruiz, S. (Author), Lehmann, H. (Author), Jackiewicz, J. (Author), Hekker, S. (Author), Gruberbauer, M. (Author), Garcia, R. A. (Author), Dumusque, X. (Author), Diaz-Fraile, D. (Author), Bradley, P. (Author), Antoci, V. (Author), Roth, M. (Author), Leroy, B. (Author), Murphy, S. J. (Author), De Cat, P. (Author), Cuypers, J. (Author), Kjeldsen, H. (Author), Christensen-Dalsgaard, J. (Author), Breger, M. (Author), Pigulski, A. (Author), Kiss, L. L. (Author), Still, M. (Author), Thompson, S. E. (Author) and Van Cleve, J. (Author) |
| Journal Title | Astronomy and Astrophysics: a European journal |
| Journal Citation | 534 |
| Article Number | A125 |
| Year | 2011 |
| Publisher | EDP Sciences |
| Place of Publication | France |
| ISSN | 0004-6361 |
| 1432-0746 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/201117368 |
| Web Address (URL) | http://arxiv.org/abs/1107.0335 |
| Abstract | The Kepler spacecraft is providing time series of photometric data with micromagnitude precision for hundreds of A-F type stars. We present a first general characterization of the pulsational behaviour of A-F type stars as observed in the Kepler light curves of a sample of 750 candidate A-F type stars. We propose three main groups to describe the observed variety in pulsating A-F type stars: gamma Dor, delta Sct, and hybrid stars. We assign 63% of our sample to one of the three groups, and identify the remaining part as rotationally modulated/active stars, binaries, stars of different spectral type, or stars that show no clear periodic variability. 23% of the stars (171 stars) are hybrid stars, which is a much larger fraction than what has been observed before. We characterize for the first time a large number of A-F type stars (475 stars) in terms of number of detected frequencies, frequency range, and typical pulsation amplitudes. The majority of hybrid stars show frequencies with all kinds of periodicities within the gamma Dor and delta Sct range, also between 5 and 10 c/d, which is a challenge for the current models. We find indications for the existence of delta Sct and gamma Dor stars beyond the edges of the current observational instability strips. The hybrid stars occupy the entire region within the delta Sct and gamma Dor instability strips, and beyond. Non-variable stars seem to exist within the instability strips. The location of gamma Dor and delta Sct classes in the (Teff,logg)-diagram has been extended. We investigate two newly constructed variables 'efficiency' and 'energy' as a means to explore the relation between gamma Dor and delta Sct stars. Our results suggest a revision of the current observational instability strips, and imply an investigation of other pulsation mechanisms to supplement the kappa mechanism and convective blocking effect to drive hybrid pulsations. |
| Keywords | stars: oscillations, stars: fundamental parameters, binaries: general, asteroseismology, stars: variables: δ Scuti, stars: statistics, Astrophysics - Solar and Stellar Astrophysics |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
| Byline Affiliations | Paris Diderot University, France |
| Leibniz Institute for Solar Physics, Germany | |
| University of La Laguna, Spain | |
| Spanish Astrobiology Centre, Spain | |
| University of Porto, Portugal | |
| Valencian International University, Spain | |
| University of Vienna, Austria | |
| Nicolaus Copernicus Astronomical Center, Poland | |
| South African Astronomical Observatory, South Africa | |
| University of Wroclaw, Poland | |
| University of Padua, Italy | |
| National Institute for Astrophysics, Italy | |
| Cote d'Azur University, France | |
| Catholic University of Leuven, Belgium | |
| Hungarian Academy of Sciences, Hungary | |
| University of Toulouse, France | |
| Karl Schwarzschild Observatory, Germany | |
| Sorbonne University, France | |
| Saint Mary's University, Canada | |
| CEA Paris-Saclay, France | |
| Los Alamos National Laboratory, United States | |
| University of Geneva, Switzerland | |
| Aarhus University, Denmark | |
| University of Texas at Austin, United States | |
| University of Sydney | |
| Institution of Origin | University of Southern Queensland |
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