Solar-Like Oscillations in Kic 11395018 and Kic 11234888 From 8 Months of Kepler Data
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Colleges, School and Institutes
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.
|Number of pages||1|
|Journal||The Astrophysical Journal|
|Publication status||Published - 1 Jun 2011|
- stars: oscillations, asteroseismology, methods: data analysis, stars: individual (KIC 11395018, KIC 11234888), stars: solar-type