dc.contributor.author |
Bedding, T. R |
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dc.contributor.author |
Huber, D |
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dc.contributor.author |
Stello, D |
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dc.contributor.author |
Elsworth, Y. P |
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dc.contributor.author |
Hekker, S |
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dc.contributor.author |
Kallinger, T |
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dc.contributor.author |
Mathur, S |
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dc.contributor.author |
Mosser, B |
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dc.contributor.author |
Preston, H. L |
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dc.contributor.author |
Ballot, J |
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dc.contributor.author |
Barban, C |
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dc.contributor.author |
Broomhall, A. M |
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dc.contributor.author |
Buzasi, D. L |
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dc.contributor.author |
Chaplin, W. J |
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dc.contributor.author |
Garcia, R. A |
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dc.contributor.author |
Gruberbauer, M |
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dc.contributor.author |
Hale, S. J |
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dc.contributor.author |
De Ridder, J |
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dc.contributor.author |
Frandsen, S |
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dc.contributor.author |
Borucki, W. J |
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dc.contributor.author |
Brown, T |
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dc.contributor.author |
Christensen-Dalsgaard, J |
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dc.contributor.author |
Gilliland, R. L |
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dc.contributor.author |
Jenkins, J. M |
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dc.contributor.author |
Kjeldsen, H |
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dc.contributor.author |
Koch, D |
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dc.contributor.author |
Belkacem, K |
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dc.contributor.author |
Bildsten, L |
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dc.contributor.author |
Bruntt, H |
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dc.contributor.author |
Campante, T. L |
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dc.contributor.author |
Deheuvels, S |
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dc.contributor.author |
Derekas, A |
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dc.contributor.author |
Dupret, M. A |
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dc.contributor.author |
Goupil, M. J |
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dc.contributor.author |
Hatzes, A |
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dc.contributor.author |
Houdek, G |
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dc.contributor.author |
Ireland, M. J |
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dc.contributor.author |
Jiang, C |
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dc.contributor.author |
Karoff, C |
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dc.contributor.author |
Kiss, L. L |
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dc.contributor.author |
Lebreton, Y |
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dc.contributor.author |
Miglio, A |
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dc.contributor.author |
Montalban, J |
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dc.contributor.author |
Noels, A |
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dc.contributor.author |
Roxburgh, I. W |
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dc.contributor.author |
Sangaralingam, V |
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dc.contributor.author |
Stevens, I. R |
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dc.contributor.author |
Suran, M. D |
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dc.contributor.author |
Tarrant, N. J |
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dc.contributor.author |
Weiss, A |
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dc.date.accessioned |
2010-01-25T11:05:34Z |
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dc.date.available |
2010-01-25T11:05:34Z |
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dc.date.issued |
2010-04 |
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dc.identifier.citation |
The Astrophysical Journal, Vol. 713, No. 2, pp. L176 - L181 |
en |
dc.identifier.issn |
0004-637X |
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dc.identifier.uri |
http://hdl.handle.net/2248/4997 |
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dc.description |
Open Access |
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dc.description.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. |
en |
dc.language.iso |
en |
en |
dc.publisher |
IOP Publishing |
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dc.relation.uri |
http://arxiv.org/abs/1001.0229 |
en |
dc.relation.uri |
http://iopscience.iop.org/2041-8205/713/2/L176/ |
|
dc.rights |
© Institute of Physics |
en |
dc.subject |
Stars: Oscillations |
en |
dc.title |
Solar-like oscillations in low-luminosity red giants: first results from Kepler |
en |
dc.type |
Article |
en |