Reference : Solar-like Oscillations in Low-luminosity Red Giants: First Results from Kepler

	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/75538

Title :	Solar-like Oscillations in Low-luminosity Red Giants: First Results from Kepler
Language :	English
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 - ULg > 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 - ULg > 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 - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
	Montalban Iglesias, Josefa [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
	Noels-Grötsch, Arlette [Université de Liège - ULg > 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]
Publication date :	1-Apr-2010
Journal title :	Astrophysical Journal
Volume :	713
Pages :	L176-L181
Audience :	International
ISSN :	0004-637X
e-ISSN :	1538-4357
Keywords :	[en] 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.
Permalink :	http://hdl.handle.net/2268/75538
DOI :	10.1088/2041-8205/713/2/L176
Other URL :	http://adsabs.harvard.edu/abs/2010ApJ...713L.176B
Commentary :	http://de.arxiv.org/abs/1001.0229

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