Reference : Kepler observations: Light shed on the hybrid γ Doradus - δ Scuti pulsation phenomenon
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/60804
Kepler observations: Light shed on the hybrid γ Doradus - δ Scuti pulsation phenomenon
English
Grigahcène, A. [Centro de Astrofísica & Dep. Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal]
Uytterhoeven, K. [Laboratoire AIM, CEA/DSM CNRS - U. Paris Diderot, IRFU/SAp, Centre de Saclay, 91191 Gif-sur-Yvette Cedex, France]
Antoci, V. [Institut für Astronomie, Türkenschanzstraße 17, A-1080 Wien, Austria]
Balona, L. [South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa]
Catanzaro, G. [INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy]
Daszyńska-Daszkiewicz, J. [Instytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, 51-622 Wrocław, Poland]
Guzik, J. A. [Los Alamos National Laboratory, X-2 MS T-086, Los Alamos, NM 87545-2345, USA]
Handler, G. [Institut für Astronomie, Türkenschanzstraße 17, A-1080 Wien, Austria]
Houdek, G. [Institut für Astronomie, Türkenschanzstraße 17, A-1080 Wien, Austria]
Kurtz, D. W. [Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK]
Marconi, M. [INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Naples, Italy]
Monteiro, M J P F G [Centro de Astrofísica & Dep. Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Portugal]
Moya, A. [ > > ]
Ripepi, V. [INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Naples, Italy]
Suárez, J*-C [Instituto de Astrofísica de Andalucía (CSIC), CP3004, Granada, Spain]
Borucki, W. J. [NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA]
Brown, T. M. [Las Cumbres Observatory Global Telescope, Goleta, CA 93117, USA]
Christensen-Dalsgaard, J. [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark]
Gilliland, R. L. [Space Telescope Science Institute, Baltimore, MD 21218, USA]
Jenkins, J. M. [SETI Institute/NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA]
Kjeldsen, H. [Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark]
Koch, D. [NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA]
Bernabei, S. [INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, 40127 Bologna, Italy]
Bradley, P. [Los Alamos National Laboratory, X-4 MS T-087, Los Alamos, NM 87545-2345, USA]
Breger, M. [Institut für Astronomie, Türkenschanzstraße 17, A-1080 Wien, Austria]
Di Criscienzo, M. [INAF-Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monte Porzio Catone, Rome, Italy]
Dupret, Marc-Antoine mailto [Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17-B 4000 Liège, Belgium]
Garcia, R. [ > > ]
García Hernández, A. [Instituto de Astrofísica de Andalucía (CSIC), CP3004, Granada, Spain]
Jackiewicz, J. [Department of Astronomy, New Mexico State University, Las Cruces, NM 88001, USA]
Kaiser, A. [Institut für Astronomie, Türkenschanzstraße 17, A-1080 Wien, Austria]
Lehmann, H. [Thüringer Landessternwarte, Sternwarte 5, 07778 Tautenburg, Germany]
Martín-Ruiz, S. [Instituto de Astrofísica de Andalucía (CSIC), CP3004, Granada, Spain]
Mathias, P. [Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 57 avenue d'Azereix, F-65000 Tarbes, France]
Molenda-Żakowicz, J. [Instytut Astronomiczny, Uniwersytet Wrocławski, Kopernika 11, 51-622 Wrocław, Poland]
Nemec, J. M. [Department of Physics & Astronomy, Camosun College, Victoria, British Columbia, Canada]
Nuspl, J. [Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary]
Paparó, M. [Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary]
Roth, M. [Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104, Freiburg, Germany]
Szabó, R. [Konkoly Observatory of the Hungarian Academy of Sciences, P.O. Box 67, H-1525 Budapest, Hungary]
Suran, M. D. [Astronomical Institute of the Romanian Academy, Str. Cutitul de Argint 5, RO 40557, Bucharest, Romenia]
Ventura, R. [INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy]
2010
Astronomische Nachrichten
331
989
Yes
International
[en] stars: oscillations ; delta Scuti stars ; gamma Doradus stars
[en] Through the observational study of stellar pulsations, the internal structure of stars can be probed and theoretical models can be tested. The main sequence γ Doradus (Dor) and δ Scuti (Sct) stars with masses 1.2-2.5 M[SUB]ȯ[/SUB] are particularly interesting for asteroseismic study. The γ Dor stars pulsate in high-order gravity (g) modes, with pulsational periods of order of one day. The δ Sct stars, on the other hand, show low-order g and pressure (p) modes with periods of order of 2 hours. Theory predicts the existence of `hybrid' stars, i.e. stars pulsating in both types of modes, in an overlap region between the instability strips of γ Dor and δ Sct stars in the Hertzsprung-Russell diagram. Hybrid stars are particularly interesting as the two types of modes probe different regions of the stellar interior and hence provide complementary model constraints. Before the advent of Kepler, only a few hybrid stars had been confirmed. The {{Kepler}} satellite is providing a true revolution in the study of and search for hybrid stars. Analysis of the first 50 days of {{Kepler}} data of hundreds of γ Dor and δ Sct candidates reveals extremely rich frequency spectra, with most stars showing frequencies in both the δ Sct and γ Dor frequency range. As these results show that there are practically no pure δ Sct or γ Dor pulsators, a new observational classification scheme is proposed by \cite{Grig10}. We present their results and characterize 234 stars in terms of δ Sct, γ Dor, δ Sct/γ Dor or γ Dor/δ Sct hybrids.
http://hdl.handle.net/2268/60804
10.1002/asna.201011443
http://adsabs.harvard.edu/abs/2010AN....331..989G

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