期刊
ASTROPHYSICAL JOURNAL
卷 831, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/0004-637X/831/1/17
关键词
asteroseismology; stars: fundamental parameters; stars: interiors; stars: solar-type
资金
- Kepler Guest Observer [KEPLER08-0013]
- NASA Astrophysics Theory Program [12-ATP12-0130]
- KITP Asteroseismology Institute at U.C. Santa Barbara
- Austrian FWF Project [P21205-N16]
- European Community's Seventh Framework Program (FP7) [269194]
- Spanish National Plan of RD [AYA2010-17803]
- NSF [AST-1514676, AST-1105930]
- NASA [NNX16AI09G, NNX13AE70G, NNX12AE17G]
- Belgian Science Policy Office (BELSPO) [C90309]
- European Research Council under the European Community's Seventh Framework Programme (FP7)/ERC [338251]
- Polish Ministry grant [NCN 2014/13/B/ST9/00902]
- Danish National Research Foundation [DNRF106]
- ASTERISK project (ASTERoseismic Investigations with SONG and Kepler) - European Research Council [267864]
- Fundao para a Cincia e Tecnologia (Portugal) [SFRH/BPD/47611/2008]
- European Community's Seventh Framework Programme (FP7) [312844]
- ANR (Agence Nationale de la Recherche, France) program IDEE [ANR-12-BS05-0008]
- CNES
- Kepler mission under NASA Cooperative [NNX11AB99A, NNX13AB58A]
- Smithsonian Astrophysical Observatory
- Austrian Science Fund (FWF) [P21205] Funding Source: Austrian Science Fund (FWF)
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/47611/2008] Funding Source: FCT
- Science and Technology Facilities Council [ST/M00077X/1] Funding Source: researchfish
- NASA [NNX13AB58A, 476394, 149453, NNX11AB99A] Funding Source: Federal RePORTER
- STFC [ST/M00077X/1] Funding Source: UKRI
theta Cygni is an F3 spectral type magnitude V = 4.48 main-sequence star that was the brightest star observed by the original Kepler spacecraft mission. Short-cadence (58.8 s) photometric data using a custom aperture were first obtained during Quarter 6 ( 2010 June-September). and subsequently in Quarters 8 and 12-17. We present analyses of solar-like oscillations based on Q6 and Q8 data, identifying angular degree l = 0, 1, and 2 modes with frequencies of 1000-2700 mu Hz, a large frequency separation of 83.9 +/- 0.4 mu Hz, and maximum oscillation amplitude at frequency nu(max) = 1829 +/- 54 mu Hz. We also present analyses of new ground-based spectroscopic observations, which, combined with interferometric angular diameter measurements, give T-eff = 6697 +/- 78 K, radius 1.49 +/- 0.03 Re-circle dot, [Fe/H] = -0.02 +/- 0.06 dex, and log g = 4.23 +/- 0.03. We calculate stellar models matching these constraints using the Yale Rotating Evolution Code and the Asteroseismic Modeling Portal. The best-fit models have masses of 1.35-1.39 M-circle dot and ages of 1.0-1.6 Gyr. theta Cyg's T-eff and log g place it cooler than the red edge of the gamma Doradus instability region established from pre-Kepler ground-based observations, but just at the red edge derived from pulsation modeling. The pulsation models show gamma Dor gravity modes driven by the convective blocking mechanism, with frequencies of 1-3 cycles per day (11 to 33 mu Hz). However, gravity modes were not seen in Kepler data; one signal at 1.776 cycles per day (20.56 mu Hz) may be attributable to a faint, possibly background, binary.
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