Article (Scientific journals)
Hybrid gamma Doradus-delta Scuti Pulsators: New Insights into the Physics of the Oscillations from Kepler Observations
Grigahcène, Ahmed; Antoci, V.; Balona, L. et al.
2010In Astrophysical Journal, 713, p. 192-L197
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Keywords :
space vehicles: instruments; stars: variables: delta Scuti
Abstract :
[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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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 - ULiège > 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
More authors (32 more) Less
Language :
English
Title :
Hybrid gamma Doradus-delta Scuti Pulsators: New Insights into the Physics of the Oscillations from Kepler Observations
Publication date :
01 April 2010
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, United States - Illinois
Volume :
713
Pages :
L192-L197
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/1001.0747
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