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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

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

Revista

Título: Astrophysical Journal

Vol. 733

Página Final: 95

ISSN: 0004-637X

Editora: American Astronomical Society

Indexação

ISI Web of Knowledge - 57 Citações

Scopus - 58 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

CORDIS: Ciências Físicas > Astronomia

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica