Reference : Hybrid gamma Doradus-delta Scuti Pulsators: New Insights into the Physics of the Oscilla...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75537
Hybrid gamma Doradus-delta Scuti Pulsators: New Insights into the Physics of the Oscillations from Kepler Observations
English
Grigahcène, Ahmed [> >]
Antoci, V. [Institut fuer Astronomie, Tuerkenschanzstr. 17, A-1180 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]
Daszynska-Daszkiewicz, J. [> >]
Guzik, J. A. [Los Alamos National Laboratory, X-2 MS T-086, Los Alamos, NM 87545-2345, USA]
Handler, G. [Institut fuer Astronomie, Tuerkenschanzstr. 17, A-1180 Wien, Austria]
Houdek, G. [Institut fuer Astronomie, Tuerkenschanzstr. 17, A-1180 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, Faculdade de Ciências, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal]
Moya, A. [Laboratorio de Astrofísica Estelar y Exoplanetas, LAEX-CAB (INTA-CSIC), P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, Spain]
Ripepi, V. [INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Naples, Italy]
Suarez [> >]
Uytterhoeven, K. [Laboratoire AIM, CEA/DSM CNRS-Université Paris Diderot, IRFU/SAp, Centre de Saclay, 91191 Gif-sur-Yvette Cedex, France]
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 fuer Astronomie, Tuerkenschanzstr. 17, A-1180 Wien, Austria]
Di Criscienzo, M. [INAF-Osservatorio Astronomico di Roma, via Frascati 33, 00040 Monte Porzio Catone, Rome, Italy]
Dupret, Marc-Antoine [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Garcí­a, R. A. [Laboratoire AIM, CEA/DSM CNRS-Université Paris Diderot, IRFU/SAp, Centre de Saclay, 91191 Gif-sur-Yvette Cedex, France]
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 fuer Astronomie, Tuerkenschanzstr. 17, A-1180 Wien, Austria]
Lehmann, H. [Thueringer Landessternwarte, 07778 Tautenburg, Germany]
Martí­n-Ruiz, S. [Instituto de Astrofísica de Andalucía (CSIC), CP3004, Granada, Spain]
Mathias, P. [Département Fizeau, UMR 6525 Observatoire de la Cöte d'Azur/CNRS, BP 4229, F06304 Nice Cedex 4, France]
Molenda-Żakowicz, J. [Instytut Astronomiczny, Uniwersytet WrocÅ awski, Kopernika 11, 51-622 WrocÅ aw, Poland]
Nemec, J. M. [Department of Physics and 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]
1-Apr-2010
Astrophysical Journal
713
L192-L197
Yes (verified by ORBi)
International
0004-637X
1538-4357
[en] space vehicles: instruments ; stars: variables: delta Scuti
[en] Observations of the pulsations of stars can be used to infer their interior structure and test theoretical models. The main-sequence γ Doradus (Dor) and δ Scuti (Sct) stars with masses 1.2-2.5 M [SUB]sun[/SUB] are particularly useful for these studies. The γ Dor stars pulsate in high-order g-modes with periods of order 1 day, driven by convective blocking at the base of their envelope convection zone. The δ Sct stars pulsate in low-order g- and p-modes with periods of order 2 hr, driven by the κ mechanism operating in the He II ionization zone. Theory predicts an overlap region in the Hertzsprung-Russell diagram between instability regions, where "hybrid" stars pulsating in both types of modes should exist. The two types of modes with properties governed by different portions of the stellar interior provide complementary model constraints. Among the known γ Dor and δ Sct stars, only four have been confirmed as hybrids. Now, analysis of combined Quarter 0 and Quarter 1 Kepler data for hundreds of variable stars shows that the frequency spectra are so rich that there are practically no pure δ Sct or γ Dor pulsators, i.e., essentially all of the stars show frequencies in both the δ Sct and the γ Dor frequency range. A new observational classification scheme is proposed that takes into account the amplitude as well as the frequency and is applied to categorize 234 stars as δ Sct, γ Dor, δ Sct/γ Dor or γ Dor/δ Sct hybrids.
http://hdl.handle.net/2268/75537
10.1088/2041-8205/713/2/L192
http://adsabs.harvard.edu/abs/2010ApJ...713L.192G
http://de.arxiv.org/abs/1001.0747

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