期刊
ASTROPHYSICAL JOURNAL
卷 733, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/733/2/95
关键词
asteroseismology; methods: data analysis; stars: individual (KIC 11395018, KIC 11234888); stars: oscillations; stars: solar-type
资金
- NASA
- KASC Working Group
- International Space Science Institute (ISSI)
- National Science Foundation
- Netherlands Organisation for Scientific Research (NWO)
- STFC [ST/F002041/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002041/1] Funding Source: researchfish
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.
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