Article (Scientific journals)
Solar-like Oscillations in Low-luminosity Red Giants: First Results from Kepler
Bedding, T. R.; Huber, D.; Stello, D. et al.
2010In Astrophysical Journal, 713, p. 176-L181
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Keywords :
stars: oscillations
Abstract :
[en] We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30 minute sampling, reveal clear oscillations in a large sample of G and K giants, extending in luminosity from the red clump down to the bottom of the giant branch. We confirm a strong correlation between the large separation of the oscillations (Πν) and the frequency of maximum power (ν[SUB]max[/SUB]). We focus on a sample of 50 low-luminosity stars (ν[SUB]max[/SUB] > 100 μHz, L <~ 30 L [SUB]sun[/SUB]) having high signal-to-noise ratios and showing the unambiguous signature of solar-like oscillations. These are H-shell-burning stars, whose oscillations should be valuable for testing models of stellar evolution and for constraining the star formation rate in the local disk. We use a new technique to compare stars on a single échelle diagram by scaling their frequencies and find well-defined ridges corresponding to radial and non-radial oscillations, including clear evidence for modes with angular degree l = 3. Measuring the small separation between l = 0 and l = 2 allows us to plot the so-called C-D diagram of δν[SUB]02[/SUB] versus Πν. The small separation δν[SUB]01[/SUB] of l = 1 from the midpoint of adjacent l = 0 modes is negative, contrary to the Sun and solar-type stars. The ridge for l = 1 is notably broadened, which we attribute to mixed modes, confirming theoretical predictions for low-luminosity giants. Overall, the results demonstrate the tremendous potential of Kepler data for asteroseismology of red giants.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Bedding, T. R.;  Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Huber, D.;  Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Stello, D.;  Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Elsworth, Y. P.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Hekker, S.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Kallinger, T.;  Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada ; Institute of Astronomy, University of Vienna, 1180 Vienna, Austria
Mathur, S.;  Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
Mosser, B.;  LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France
Preston, H. L.;  Eureka Scientific, 2452 Delmer Street Suite 100, Oakland, CA 94602-3017, USA ; Department of Mathematical Sciences, University of South Africa, Box 392 UNISA 0003, South Africa
Ballot, J.;  Laboratoire d'Astrophysique de Toulouse-Tarbes Université de Toulouse, CNRS 14 av E. Belin 31400 Toulouse, France
Barban, C.;  LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France
Broomhall, A. M.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Buzasi, D. L.;  Eureka Scientific, 2452 Delmer Street Suite 100, Oakland, CA 94602-3017, USA
Chaplin, W. J.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Garcí­a, R. A.;  Laboratoire AIM, CEA/DSM-CNRS, Université Paris 7 Diderot, IRFU/SAp, Centre de Saclay, 91191, Gif-sur-Yvette, France
Gruberbauer, M.;  Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3, Canada
Hale, S. J.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
De Ridder, J.;  Instituut voor Sterrenkunde, K.U.Leuven, Belgium
Frandsen, S.;  Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Borucki, W. J.;  NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA
Brown, T.;  Las Cumbres Observatory Global Telescope, Goleta, CA 93117, USA
Christensen-Dalsgaard, J.;  Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Gilliland, R. L.;  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Jenkins, J. M.;  SETI Institute/NASA Ames Research Center, MS 244-30, Moffett Field, CA 94035, USA
Kjeldsen, H.;  Danish AsteroSeismology Centre (DASC), 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
Belkacem, Kevin ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Bildsten, L.;  Kavli Institute for Theoretical Physics and Department of Physics, University of California, Santa Barbara, CA 93106, USA
Bruntt, H.;  LESIA, CNRS, UniversitéPierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France ; Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark
Campante, T. L.;  Danish AsteroSeismology Centre (DASC), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark ; Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
Deheuvels, S.;  LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France
Derekas, A.;  Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia ; Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 67, Hungary
Dupret, Marc-Antoine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Goupil, M.-J.;  LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France
Hatzes, A.;  Thueringer Landessternwarte Tautenburg, Sternwarte 5, D-07778, Tautenburg, Germany
Houdek, G.;  Institute of Astronomy, University of Vienna, 1180 Vienna, Austria
Ireland, M. J.;  Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
Jiang, C.;  Department of Astronomy, Beijing Normal University, China
Karoff, C.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Kiss, L. L.;  Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia ; Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, P.O. Box 67, Hungary
Lebreton, Y.;  LESIA, CNRS, Université Pierre et Marie Curie, Université Denis, Diderot, Observatoire de Paris, 92195 Meudon Cedex, France
Miglio, Andrea ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Montalban Iglesias, Josefa ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Noels-Grötsch, Arlette ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Roxburgh, I. W.;  Queen Mary University of London, Mile End Road, London E1 4NS, UK
Sangaralingam, V.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Stevens, I. R.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Suran, M. D.;  Astronomical Institute of the Romanian Academy, Str. Cutitul de Argint, 5, RO 40557,Bucharest, Romania
Tarrant, N. J.;  School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK
Weiss, A.;  Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany
More authors (40 more) Less
Language :
English
Title :
Solar-like Oscillations in Low-luminosity Red Giants: First Results from Kepler
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 :
L176-L181
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/1001.0229
Available on ORBi :
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