Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/137689
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- Title
- Solar-like oscillations in low-luminosity red giants : first results from Kepler
- Related
- Astrophysical journal. Letters, Vol. 713, No. 2, (2010), p.L176-L181
- DOI
- 10.1088/2041-8205/713/2/L176
- Publisher
- Institute of Physics Publishing
- Date
- 2010
- Author/Creator
- Bedding, T. R
- Author/Creator
- Huber, D
- Author/Creator
- Barban, C
- Author/Creator
- Broomhall, A. M
- Author/Creator
- Buzasi, D. L
- Author/Creator
- Chaplin, W. J
- Author/Creator
- Garcia, R. A
- Author/Creator
- Gruberbauer, M
- Author/Creator
- Hale, S. J
- Author/Creator
- De Ridder, J
- Author/Creator
- Frandsen, S
- Author/Creator
- Borucki, W. J
- Author/Creator
- Stello, D
- Author/Creator
- Brown, T
- Author/Creator
- Christensen-Dalsgaard, J
- Author/Creator
- Gilliland, R. L
- Author/Creator
- Jenkins, J. M
- Author/Creator
- Kjeldsen, H
- Author/Creator
- Koch, D
- Author/Creator
- Belkacem, K
- Author/Creator
- Bildsten, L
- Author/Creator
- Bruntt, H
- Author/Creator
- Campante, T. L
- Author/Creator
- Elsworth, Y. P
- Author/Creator
- Deheuvels, S
- Author/Creator
- Derekas, A
- Author/Creator
- Dupret, M.-A
- Author/Creator
- Goupil, M.-J
- Author/Creator
- Hatzes, A
- Author/Creator
- Houdek, G
- Author/Creator
- Ireland, M. J
- Author/Creator
- Jiang, C
- Author/Creator
- Karoff, C
- Author/Creator
- Kiss, L.L
- Author/Creator
- Hekker, S
- Author/Creator
- Lebreton, Y
- Author/Creator
- Miglio, A
- Author/Creator
- Montalbán, J
- Author/Creator
- Noels, A
- Author/Creator
- Roxburgh, I. W
- Author/Creator
- Sangaralingam, V
- Author/Creator
- Stevens, I. R
- Author/Creator
- Suran, M. D
- Author/Creator
- Tarrant, N. J
- Author/Creator
- Weiss, A
- Author/Creator
- Kallinger, T
- Author/Creator
- Mathur, S
- Author/Creator
- Mosser, B
- Author/Creator
- Preston, H. L
- Author/Creator
- Ballot, J
- Description
- 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 (Δν) and the frequency of maximum power (νmax). We focus on a sample of 50 low-luminosity stars (νmax > 100 μHz, L ≲ 30L) 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 δν02 versus Δν. The small separation δν01 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
- 6 page(s)
- Subject Keyword
- Stars: oscillations
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Physics and Astronomy
- Identifier
- http://hdl.handle.net/1959.14/137689
- Identifier
- ISSN:2041-8205
- Identifier
- mq_res-ext-2-s2.0-77950576354
- Language
- eng
- Reviewed
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