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Solar-like oscillations in low-luminosity red giants: first results from Kepler | | T. R. Bedding
; D. Huber
; D. Stello
; Y. P. Elsworth
; S. Hekker
; T. Kallinger
; S. Mathur
; B. Mosser
; H. L. Preston
; J. Ballot
; C. Barban
; A. M. Broomhall
; D. L. Buzasi
; W. J. Chaplin
; R. A. Garcia
; M. Gruberbauer
; S. J. Hale
; J. De Ridder
; S. Frandsen
; W. J. Borucki
; T. Brown
; J. Christensen-Dalsgaard
; R. L. Gilliland
; J. M. Jenkins
; H. Kjeldsen
; D. Koch
; K. Belkacem
; L. Bildsten
; H. Bruntt
; T. L. Campante
; S. Deheuvels
; A. Derekas
; M.-A. Dupret
; M.-J. Goupil
; A. Hatzes
; G. Houdek
; M. J. Ireland
; C. Jiang
; C. Karoff
; L. L. Kiss
; Y. Lebreton
; A. Miglio
; J. Montalban
; A. Noels
; I. W. Roxburgh
; V. Sangaralingam
; I. R. Stevens
; M. D. Suran
; N. J. Tarrant
; A. Weiss
; | | Date: |
1 Jan 2010 | | 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. | | Source: | arXiv, 1001.0229 | | Services: | Forum | Review | PDF | Favorites | |
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