Solar-like Oscillations in KIC 11395018 and KIC 11234888 from 8 Months of Kepler Data
Abstract
We analyze the photometric short-cadence data obtained with the Kepler mission during the first 8 months of observations of two solar-type stars of spectral types G and F: KIC 11395018 and KIC 11234888, respectively, the latter having a lower signal-to-noise ratio (S/N) compared with the former. We estimate global parameters of the acoustic (p) modes such as the average large and small frequency separations, the frequency of the maximum of the p-mode envelope, and the average line width of the acoustic modes. We were able to identify and to measure 22 p-mode frequencies for the first star and 16 for the second one even though the S/N of these stars are rather low. We also derive some information about the stellar rotation periods from the analyses of the low-frequency parts of the power spectral densities. A model-independent estimation of the mean density, mass, and radius is obtained using the scaling laws. We emphasize the importance of continued observations for the stars with low S/N for an improved characterization of the oscillation modes. Our results offer a preview of what will be possible for many stars with the long data sets obtained during the remainder of the mission.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- June 2011
- DOI:
- 10.1088/0004-637X/733/2/95
- arXiv:
- arXiv:1103.4085
- Bibcode:
- 2011ApJ...733...95M
- Keywords:
-
- asteroseismology;
- methods: data analysis;
- stars: individual: KIC 11395018 KIC 11234888;
- stars: oscillations;
- stars: solar-type;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 39 pages, 9 figures. Accepted for publication in ApJ