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Title: Solar-like oscillations in low-luminosity red giants: first results from Kepler
Authors: Bedding, T. R
Huber, D
Stello, D
Elsworth, Y. P
Hekker, S
Kallinger, T
Mathur, S
Mosser, B
Preston, H. L
Ballot, J
Barban, C
Broomhall, A. M
Buzasi, D. L
Chaplin, W. J
Garcia, R. A
Gruberbauer, M
Hale, S. J
De Ridder, J
Frandsen, S
Borucki, W. J
Brown, T
Christensen-Dalsgaard, J
Gilliland, R. L
Jenkins, J. M
Kjeldsen, H
Koch, D
Belkacem, K
Bildsten, L
Bruntt, H
Campante, T. L
Deheuvels, S
Derekas, A
Dupret, M. A
Goupil, M. J
Hatzes, A
Houdek, G
Ireland, M. J
Jiang, C
Karoff, C
Kiss, L. L
Lebreton, Y
Miglio, A
Montalban, J
Noels, A
Roxburgh, I. W
Sangaralingam, V
Stevens, I. R
Suran, M. D
Tarrant, N. J
Weiss, A
Keywords: Stars: Oscillations
Issue Date: Apr-2010
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 713, No. 2, pp. L176 - L181
Abstract: 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 (Delta nu) and the frequency of maximum power (nu_max). We focus on a sample of 50 low-luminosity stars (nu_max > 100 muHz, L <~ 30 L_sun) 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 echelle 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 delta nu_02 versus Delta nu. The small separation delta nu_01 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.
Description: Open Access
ISSN: 0004-637X
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