Asteroseismic Diagrams from a Survey of Solar-like Oscillations with Kepler
Abstract
Photometric observations made by the NASA Kepler Mission have led to a dramatic increase in the number of main-sequence and subgiant stars with detected solar-like oscillations. We present an ensemble asteroseismic analysis of 76 solar-type stars. Using frequencies determined from the Kepler time-series photometry, we have measured three asteroseismic parameters that characterize the oscillations: the large frequency separation (Δν), the small frequency separation between modes of l = 0 and l = 2 (δν02), and the dimensionless offset (epsilon). These measurements allow us to construct asteroseismic diagrams, namely the so-called Christensen-Dalsgaard diagram of δν02 versus Δν, and the recently re-introduced epsilon diagram. We compare the Kepler results with previously observed solar-type stars and with theoretical models. The positions of stars in these diagrams places constraints on their masses and ages. Additionally, we confirm the observational relationship between epsilon and T eff that allows for the unambiguous determination of radial order and should help resolve the problem of mode identification in F stars.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 2011
- DOI:
- 10.1088/2041-8205/742/1/L3
- arXiv:
- arXiv:1110.1375
- Bibcode:
- 2011ApJ...742L...3W
- Keywords:
-
- stars: oscillations;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 6 pages, 5 figures, accepted for publication in The Astrophysical Journal Letters