SOLAR-LIKE OSCILLATIONS IN KIC 11395018 AND KIC 11234888 FROM 8 MONTHS OF KEPLER DATA

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Mathur, S (Author) Other; Handberg, R (Author) Other; Campante, TL (Author) Other; Garcia, A (Author) Other; Appourchaux, T (Author) Other; Bedding, TR (Author) Other; Mosser, B (Author) Other; Chaplin, WJ (Author) Other; Ballot, J (Author) Other; Benomar, O (Author) Other; Bonanno, A (Author) Other; Corsaro, E (Author) Other; Gaulme, P (Author) Other; Hekker, S (Author) Other; Regulo, C (Author) Other; Salabert, D (Author) Other; Verner, G (Author) Other; White, TR (Author) Other; Brandao, IM (Author) Other; Creevey, OL (Author) Other; Dogan, G (Author) Other; Elsworth, Y (Author) Other; Huber, D (Author) Other; Hale, SJ (Author) Other; Houdek, G (Author) Other; Karoff, C (Author) Other; Metcalfe, TS (Author) Other; Molenda Zakowicz, J (Author) Other; Monteiro, MJPFG (Author) FCUP; Thompson, MJ (Author) Other; Christensen Dalsgaard, J (Author) Other; Gilliland, RL (Author) Other; Kawaler, SD (Author) Other; Kjeldsen, H (Author) Other; Quintana, EV (Author) Other; Sanderfer, DT (Author) Other; Seader, SE (Author) Other

Journal

Title: Astrophysical Journal

Vol. 733

Final page: 95

ISSN: 0004-637X

Publisher: American Astronomical Society

Indexing

ISI Web of Knowledge - 57 Citations

Scopus - 58 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

CORDIS: Physical sciences > Astronomy

Other information

Authenticus ID: P-002-R1C

DOI: 10.1088/0004-637x/733/2/95

Resumo (PT): 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.

Abstract (EN): 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.

Language: English

Type (Professor's evaluation): Scientific