space vehicles: instruments; stars: variables: delta Scuti
Abstract :
[en] Observations of the pulsations of stars can be used to infer their interior structure and test theoretical models. The main-sequence γ Doradus (Dor) and δ Scuti (Sct) stars with masses 1.2-2.5 M [SUB]sun[/SUB] are particularly useful for these studies. The γ Dor stars pulsate in high-order g-modes with periods of order 1 day, driven by convective blocking at the base of their envelope convection zone. The δ Sct stars pulsate in low-order g- and p-modes with periods of order 2 hr, driven by the κ mechanism operating in the He II ionization zone. Theory predicts an overlap region in the Hertzsprung-Russell diagram between instability regions, where "hybrid" stars pulsating in both types of modes should exist. The two types of modes with properties governed by different portions of the stellar interior provide complementary model constraints. Among the known γ Dor and δ Sct stars, only four have been confirmed as hybrids. Now, analysis of combined Quarter 0 and Quarter 1 Kepler data for hundreds of variable stars shows that the frequency spectra are so rich that there are practically no pure δ Sct or γ Dor pulsators, i.e., essentially all of the stars show frequencies in both the δ Sct and the γ Dor frequency range. A new observational classification scheme is proposed that takes into account the amplitude as well as the frequency and is applied to categorize 234 stars as δ Sct, γ Dor, δ Sct/γ Dor or γ Dor/δ Sct hybrids.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Grigahcène, Ahmed
Antoci, V.; Institut fuer Astronomie, Tuerkenschanzstr. 17, A-1180 Wien, Austria
Balona, L.; South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
Catanzaro, G.; INAF-Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
Daszynska-Daszkiewicz, J.
Guzik, J. A.; Los Alamos National Laboratory, X-2 MS T-086, Los Alamos, NM 87545-2345, USA
Handler, G.; Institut fuer Astronomie, Tuerkenschanzstr. 17, A-1180 Wien, Austria
Houdek, G.; Institut fuer Astronomie, Tuerkenschanzstr. 17, A-1180 Wien, Austria
Kurtz, D. W.; Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire, Preston PR1Â 2HE, UK
Marconi, M.; INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Naples, Italy
Monteiro, M J P F G; Centro de AstrofÃsica, Faculdade de Ciências, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
Moya, A.; Laboratorio de AstrofÃsica Estelar y Exoplanetas, LAEX-CAB (INTA-CSIC), P.O. Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
Ripepi, V.; INAF-Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Naples, Italy
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
Bibliography
Antoci, V., Handler, G., Carrier, F., Grundahl, F., Matthews, J. M., Hareter, M., Kuschnig, R., & Houdek, G. 2009, Stellar Pulsation: Challenges for Theory and Observation (AIP Conf. Proc. 1170), ed. J. A. Guzik & P. A. Bradley (Melville, NY: AIP), 440
Auvergne, M. et al. 2009, A&A, 506, 411
Baker, N. & Gough, D. O. 1979, ApJ, 234, 232
Balona, L. A., Krisciunas, K., & Cousins, A. W. J. 1994, MNRAS, 270, 905
Bono, G., Marconi, M., & Stellingwerf, R. 1999, ApJS, 122, 167
Bouabid, M. -P., Montalbn, J., Miglio, A., Dupret, M.-A., Grigahcène, A., & Noels, A. 2009, Stellar Pulsation: Challenges for Theory and Observation (AIP Conf. Proc. 1170), ed. J. A. Guzik & P. A. Bradley (Melville, NY: AIP), 477
Breger, M. & Beichbuchner, F. 1996, A&A, 313, 851
Breger, M., Lenz, P., & Pamyatnykh, A. A. 2009, MNRAS, 396, 291
Chevalier, C. 1971, A&A, 14, 24
Christensen-Dalsgaard, J. 2000, Delta Scuti and Related Stars (ASP Conf. Ser. 210), ed. M. Breger & M. H. Montgomery (San Francisco, CA: ASP), 187
Crawford, D. L. 1979, AJ, 84, 1858
Daszyńska-Daszkiewicz, J., Dziembowski, W. A., & Pamyatnykh, A. A. 2003, A&A, 407, 999
Deupree, R. G. 1977, ApJ, 215, 232
Dupret, M.-A., Grigahcène, A., Garrido, R., Gabriel, M., & Scuflaire, R. 2005, A&A, 435, 927
García, R. A., Turck-Chiéze, S., Jiménez-Reyes, S. J., Ballot, J., Pallé, P. L., Eff-Darwich, A., Mathur, S., & Provost, J. 2007, Science, 316, 1591
García-Hernndez, A. et al. 2009, A&A, 506, 79
Gonzi, G. 1982, A&A, 110, 1
Grigahcène, A., Dupret, M.-A., Gabriel, M., Garrido, R., & Scuflaire, R. 2005, A&A, 434, 1055
Guzik, J. A., Kaye, A. B., Bradley, P. A., Cox, A. N., & Neuforge, C. 2000, ApJ, 542, 57
Handler, G. 2009, MNRAS, 398, 1339
Handler, G. & Shobbrook, R. R. 2002, MNRAS, 333, 251
Handler, G. et al. 2000, MNRAS, 318, 511
Handler, G. et al. 2002, MNRAS, 333, 262
Henry, G. W. & Fekel, F. C. 2005, AJ, 129, 2026
Henry, G. W., Fekel, F. C., & Henry, S. M. 2007, AJ, 133, 1421
Houdek, G. 2000, Delta Scuti and Related Stars (ASP Conf. Ser. 210), ed. M. Breger & M. H. Montgomery (San Francisco, CA: ASP), 454
Houdek, G., Balmforth, N. J., Christensen-Dalsgaard, J., & Gough, D. O. 1999, A&A, 351, 582
Kaye, A. B., Handler, G., Krisciunas, K., Poretti, E., & Zerbi, F. M. 1999, PASP, 111, 840
King, H. et al. 2006, Commun. Asteroseismol., 148, 28
Kurtz, D. W. 1989, MNRAS, 238, 1077
Mathias, P. et al. 2009, Stellar Pulsation: Challenges for Theory and Observation (AIP Conf. Proc. Ser. 1170), ed. J. A. Guzik & P. A. Bradley (Melville, NY: AIP), 486
Matthews, J. M. 2007, Commun. Asteroseismol., 150, 333
Miglio, A., Montalbn, J., Noels, N., & Eggenberger, P. 2008, MNRAS, 386, 1487
Moya, A., Surez, J. C., Amado, P. J., Martín-Ruíz, S., & Garrido, R. 2005, A&A, 432, 189
Pereira, T. M. D. et al. 2007, A&A, 464, 659
Poretti, E. et al. 2009, A&A, 506, 85
Reese, D., Lignières, F., & Rieutord, M. 2008, A&A, 481, 449
Rodríguez, E. & Breger, M. 2001, A&A, 366, 178
Rodríguez, E., López-Gonzlez, M. J., & López de Coca, P. 2000, A&AS, 144, 369
Rowe, J. F. et al. 2006, Commun. Asteroseismol., 148, 34
Samadi, R., Goupil, M.-J., & Houdek, G. 2002, A&A, 395, 563
Smeyers, P. & Moya, A. 2007, A&A, 465, 509
Stellingwerf, R. F. 1984, ApJ, 284, 712
Surez, J. C., Goupil, M. J., & Morel, P. 2006, A&A, 449, 673
Surez, J. C., Moya, A., Martín-Ruíz, S., Amado, P. J., Grigahcène, A., & Garrido, R. 2005, A&A, 443, 271
Uytterhoeven, K. et al. 2008, A&A, 489, 1213
Xiong, D. R. & Deng, L. 2007, MNRAS, 378, 1270
Similar publications
Sorry the service is unavailable at the moment. Please try again later.
This website uses cookies to improve user experience. Read more
Save & Close
Accept all
Decline all
Show detailsHide details
Cookie declaration
About cookies
Strictly necessary
Performance
Strictly necessary cookies allow core website functionality such as user login and account management. The website cannot be used properly without strictly necessary cookies.
This cookie is used by Cookie-Script.com service to remember visitor cookie consent preferences. It is necessary for Cookie-Script.com cookie banner to work properly.
Performance cookies are used to see how visitors use the website, eg. analytics cookies. Those cookies cannot be used to directly identify a certain visitor.
Used to store the attribution information, the referrer initially used to visit the website
Cookies are small text files that are placed on your computer by websites that you visit. Websites use cookies to help users navigate efficiently and perform certain functions. Cookies that are required for the website to operate properly are allowed to be set without your permission. All other cookies need to be approved before they can be set in the browser.
You can change your consent to cookie usage at any time on our Privacy Policy page.