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.
Original language | English (US) |
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Article number | 95 |
Journal | Astrophysical Journal |
Volume | 733 |
Issue number | 2 |
DOIs | |
State | Published - Jun 1 2011 |
Keywords
- asteroseismology
- methods: data analysis
- stars: individual (KIC 11395018, KIC 11234888)
- stars: oscillations
- stars: solar-type
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science