Detection of Solar-Like Oscillations, Observational Constraints, and Stellar Models for θ Cyg, the Brightest Star Observed by the Kepler Mission
Abstract
θ 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 μHz, a large frequency separation of 83.9 ± 0.4 μHz, and maximum oscillation amplitude at frequency νmax = 1829 ± 54 μHz. 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 R ⊙, [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 ⊙ and ages of 1.0–1.6 Gyr. θ Cyg's T eff and log g place it cooler than the red edge of the γ Doradus instability region established from pre-Kepler ground-based observations, but just atmore »
- Authors:
-
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- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Aarhus Univ. (Denmark)
- Aarhus Univ. (Denmark); Univ. of Birmingham (United Kingdom)
- Keele Univ. (United Kingdom)
- Univ. of Central Lancashire, Preston (United Kingdom)
- Pennsylvania State Univ., University Park, PA (United States)
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
- NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Bay Area Environmental Research Inst., Sonoma, CA (United States)
- Univ. Paris-Sud, Orsay (France)
- Yale Univ., New Haven, CT (United States)
- Aarhus Univ. (Denmark); Univ. of Sydney, NSW (Australia)
- Univ. of Sydney, NSW (Australia); New York Univ., Abu Dhabi (United Arab Emirates)
- Univ. of Paris Diderot, Gif-sur-Yvette (France)
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
- Space Science Inst., Boulder, CO (United States)
- Katholieke Univ., Leuven (Belgium)
- Aarhus Univ. (Denmark); Univ. of Sydney, NSW (Australia); Australian Astronomical Observatory, North Ryde, NSW (Australia)
- Katholieke Univ., Leuven (Belgium); Radboud Univ., Nijmegen (Netherlands)
- Univerisite de Toulouse, Tarbes, France
- Univ. de Liege (Belgium)
- Aarhus Univ. (Denmark); Aarhus Katedralskole, Skolegyde, Aarhus (Denmark)
- Univ. of Copenhagen (Denmark). The Niels Bohr Inst.; Univ. of Copenhagen (Denmark). Centre for Star and Planet Formation and Natural History Museum of Denmark
- Astrophysical Observatory of Catania (Italy)
- Aarhus Univ. (Denmark); Univ. of Birmingham (United Kingdom); Univ. of Paris Diderot, Gif-sur-Yvette (France)
- Aarhus Univ. (Denmark); National Center for Atmospheric Research, Boulder, CO (United States)
- Univ. of Chicago, IL (United States)
- Keele Univ. (United Kingdom); Univ. of Warwick, Coventry (United Kingdom)
- Apache Point Observatory, Sunspot, NM (United States); New Mexico State Univ., Las Cruces, NM (United States)
- Saint Mary's Univ., Halifax, NS (Canada)
- Aarhus Univ. (Denmark); Max Planck Inst. for Solar System Research, Gottingen (Germany)
- Thuringer Landessternwarte Tautenburg (Germany)
- Univ. de Toulouse, Tarbes (France); National Centre for Scientific Research (CNRS), Tarbes (France). Center for Spatial Study of Radiation
- Univ. of Wroclaw (Poland)
- Sorbonne Univ., Paris (France). LESIA Observatoire de Paris
- Inst. of Astrophysics of the Canary Islands, Tenerife (Spain); Univ. de La Laguna, Tenerife (Spain)
- Istituto Nazionale di Fisica Nucleare (INFN), Napoli (Italy). Osservatorio Astronomico di Capodimonte
- Univ. of Porto (Portugal)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics and Space Administration (NASA); USDOE
- OSTI Identifier:
- 1345147
- Report Number(s):
- LA-UR-16-22306
Journal ID: ISSN 1538-4357; TRN: US1701349
- Grant/Contract Number:
- AC52-06NA25396; KEPLER08-0013; 12-ATP12-0130; NNX12AE17G; 269194; 267864; DNRF106; NNX13AE70G; NNX16AI09G; AST-1105930; AST-1514676; AYA2010-17803
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 831; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS
Citation Formats
Guzik, Joyce Ann, Houdek, G., Chaplin, W. J., Smalley, B., Kurtz, D. W., Gilliland, R. L., Mullally, F., Rowe, J. F., Bryson, S. T., Still, M. D., Antoci, V., Appourchaux, T., Basu, S., Bedding, T.R., Benomar, O., Garcia, R.A., Huber, D., Kjeldsen, H., Latham, D., Metcalfe, T. S., Papics, P. I., White, T. R., Aerts, C., Ballot, J., Boyajian, T.S., Briquet, M., Bruntt, H., Buchhave, L.A., Campante, T.L., Catanzaro, G., Christensen-Dalsgaard, J., Davies, G.R., Dogan, G., Dragomir, D., Doyle, A.P., Elsworth, Y., Frasca, A., Gaulme, P., Gruberbauer, M., Handberg, R., Hekker, S., Karoff, C., Lehmann, H., Mathias, P., Mathur, S., Miglio, A., Molenda-Zakowicz, J., Mosser, B., Murphy, S. J., Regulo, C., Ripepi, V., Salabert, D., Sousa, S., Stello, D., and Uytterhoeven, K. Detection of Solar-Like Oscillations, Observational Constraints, and Stellar Models for θ Cyg, the Brightest Star Observed by the Kepler Mission. United States: N. p., 2016.
Web. doi:10.3847/0004-637X/831/1/17.
Guzik, Joyce Ann, Houdek, G., Chaplin, W. J., Smalley, B., Kurtz, D. W., Gilliland, R. L., Mullally, F., Rowe, J. F., Bryson, S. T., Still, M. D., Antoci, V., Appourchaux, T., Basu, S., Bedding, T.R., Benomar, O., Garcia, R.A., Huber, D., Kjeldsen, H., Latham, D., Metcalfe, T. S., Papics, P. I., White, T. R., Aerts, C., Ballot, J., Boyajian, T.S., Briquet, M., Bruntt, H., Buchhave, L.A., Campante, T.L., Catanzaro, G., Christensen-Dalsgaard, J., Davies, G.R., Dogan, G., Dragomir, D., Doyle, A.P., Elsworth, Y., Frasca, A., Gaulme, P., Gruberbauer, M., Handberg, R., Hekker, S., Karoff, C., Lehmann, H., Mathias, P., Mathur, S., Miglio, A., Molenda-Zakowicz, J., Mosser, B., Murphy, S. J., Regulo, C., Ripepi, V., Salabert, D., Sousa, S., Stello, D., & Uytterhoeven, K. Detection of Solar-Like Oscillations, Observational Constraints, and Stellar Models for θ Cyg, the Brightest Star Observed by the Kepler Mission. United States. https://doi.org/10.3847/0004-637X/831/1/17
Guzik, Joyce Ann, Houdek, G., Chaplin, W. J., Smalley, B., Kurtz, D. W., Gilliland, R. L., Mullally, F., Rowe, J. F., Bryson, S. T., Still, M. D., Antoci, V., Appourchaux, T., Basu, S., Bedding, T.R., Benomar, O., Garcia, R.A., Huber, D., Kjeldsen, H., Latham, D., Metcalfe, T. S., Papics, P. I., White, T. R., Aerts, C., Ballot, J., Boyajian, T.S., Briquet, M., Bruntt, H., Buchhave, L.A., Campante, T.L., Catanzaro, G., Christensen-Dalsgaard, J., Davies, G.R., Dogan, G., Dragomir, D., Doyle, A.P., Elsworth, Y., Frasca, A., Gaulme, P., Gruberbauer, M., Handberg, R., Hekker, S., Karoff, C., Lehmann, H., Mathias, P., Mathur, S., Miglio, A., Molenda-Zakowicz, J., Mosser, B., Murphy, S. J., Regulo, C., Ripepi, V., Salabert, D., Sousa, S., Stello, D., and Uytterhoeven, K. Fri .
"Detection of Solar-Like Oscillations, Observational Constraints, and Stellar Models for θ Cyg, the Brightest Star Observed by the Kepler Mission". United States. https://doi.org/10.3847/0004-637X/831/1/17. https://www.osti.gov/servlets/purl/1345147.
@article{osti_1345147,
title = {Detection of Solar-Like Oscillations, Observational Constraints, and Stellar Models for θ Cyg, the Brightest Star Observed by the Kepler Mission},
author = {Guzik, Joyce Ann and Houdek, G. and Chaplin, W. J. and Smalley, B. and Kurtz, D. W. and Gilliland, R. L. and Mullally, F. and Rowe, J. F. and Bryson, S. T. and Still, M. D. and Antoci, V. and Appourchaux, T. and Basu, S. and Bedding, T.R. and Benomar, O. and Garcia, R.A. and Huber, D. and Kjeldsen, H. and Latham, D. and Metcalfe, T. S. and Papics, P. I. and White, T. R. and Aerts, C. and Ballot, J. and Boyajian, T.S. and Briquet, M. and Bruntt, H. and Buchhave, L.A. and Campante, T.L. and Catanzaro, G. and Christensen-Dalsgaard, J. and Davies, G.R. and Dogan, G. and Dragomir, D. and Doyle, A.P. and Elsworth, Y. and Frasca, A. and Gaulme, P. and Gruberbauer, M. and Handberg, R. and Hekker, S. and Karoff, C. and Lehmann, H. and Mathias, P. and Mathur, S. and Miglio, A. and Molenda-Zakowicz, J. and Mosser, B. and Murphy, S. J. and Regulo, C. and Ripepi, V. and Salabert, D. and Sousa, S. and Stello, D. and Uytterhoeven, K.},
abstractNote = {θ 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 μHz, a large frequency separation of 83.9 ± 0.4 μHz, and maximum oscillation amplitude at frequency νmax = 1829 ± 54 μHz. 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 R ⊙, [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 ⊙ and ages of 1.0–1.6 Gyr. θ Cyg's T eff and log g place it cooler than the red edge of the γ Doradus instability region established from pre-Kepler ground-based observations, but just at the red edge derived from pulsation modeling. Lastly, the pulsation models show γ Dor gravity modes driven by the convective blocking mechanism, with frequencies of 1–3 cycles per day (11 to 33 μHz). However, gravity modes were not seen in Kepler data; one signal at 1.776 cycles per day (20.56 μHz) may be attributable to a faint, possibly background, binary.},
doi = {10.3847/0004-637X/831/1/17},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 831,
place = {United States},
year = {2016},
month = {10}
}
Web of Science
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