[en] Context: Observations suggest that a relationship exists between the driving mechanism of roAp star pulsations and the heavy element distribution in these stars. Aims: We attempt to study the effects of local and global metallicity variations on the excitation mechanism of high order p-modes in A star models. Methods: We developed stellar evolutionary models to describe magnetic A stars with different global metallicity or local metal accumulation profiles. These models were computed with CLES (``Code Liègeois d'évolution stellaire''), and the stability of our models was assessed with the non-adiabatic oscillation code MAD. Results: Our models reproduce the blue edge of the roAp star instability strip, but generate a red edge hotter than the observed one, regardless of metallicity. Surprisingly, we find that an increase in opacity inside the driving region can produce a lower amount of driving, which we refer to as the ``inverse kappa-mechanism''.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Théado, S.; Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 avenue Edouard Belin, 31400 Toulouse, France ; Institut d'Astrophysique et de Géophysique de Liège, Allé du 6 Août 17, 4000 Liège, Belgium
Dupret, Marc-Antoine ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique
Noels-Grötsch, Arlette ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Ferguson, J. W.; Department of Physics, Wichita State University, Wichita, KS 67260-0032, USA
Language :
English
Title :
New light on the driving mechanism in roAp stars. I. Effects of metallicity
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
Anders, E., & Grevesse, N. 1989, Geochim. Cosmochim. Acta, 53, 197
Asplund, M., Grevesse, N., & Sauval, A. J. 2005, in Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis, ed. T. G. Barnes, III, & R N. Bash, ASP Conf. Ser., 336, 25
Babel, J., & Michaud, G. 1991, ApJ, 366, 560
Bagnulo, S., Wade, G. A., Donati, J.-F., et al. 2001, A&A, 369, 889
Balmforth, N. J., Cunha, M. S., Dolez, N., Gough, D. O., & Vauclair, S. 2001, MNRAS, 323, 362
Bigot, L., Provost, J., Berthomieu, G., Dziembowski, W. A., & Goode, P. R. 2000, A&A, 356, 218
Brown, A., Veale, A., Judge, P., Bookbinder, J. A., & Hubeny, I. 1990, ApJ, 361, 220
Cowley, C. R., Ryabchikova, T., Kupka, F., et al. 2000, MNRAS, 317, 299
Cox, J. P. 1984, ApJ, 280, 220
Cunha, M. S. 2002, MNRAS, 333, 47
Cunha, M. S. 2007, Commun. Asteroseismol., 150, 48
Cunha, M. S., & Gough, D. 2000, MNRAS, 319, 1020
Dolez, N., & Gough, D. O. 1982, in Pulsations in Classical and Cataclysmic Variable Stars, ed. J. P. Cox, & C. J. Hansen, 248
Dolez, N., Gough, D. O., & Vauclair, S. 1988, in Advances in Helio- and Asteroseismology, ed. J. Christensen-Dalsgaard, & S. Frandsen, IAU Symp., 123, 291
Hubrig, S., Szeifert, T., Schöller, M., Mathys, G., & Kurtz, D. W. 2004, A&A, 415, 685
Hubrig, S., Nesvacil, N., Schöller, M., et al. 2005, A&A, 440, L37
Iglesias. C. A., & Rogers, F. J. 1996, ApJ, 464, 943
Kochukhov, O. 2003, A&A, 404, 669
Kochukhov, O., & Bagnulo, S. 2006, A&A, 450, 763
Kochukhov, O., Piskunov, N., Ilyin, I., Ilyina, S., & Tuominen, I. 2002, A&A, 389, 420
Kochukhov, O., Drake, N. A., Piskunov, N., & de la Reza, R. 2004, A&A, 424, 935
Kochukhov, O., Ryabchikova, T., Weiss, W. W., Landstreet, J. D., & Lyashko, D. 2007, MNRAS, 376, 651
Kupka, F., Ryabchikova, T. A., Weiss, W. W., et al. 1996, A&A, 308, 886
Kurtz, D. W. 1982, MNRAS, 200, 807
Kurtz, D. W. 1990, ARA&A, 28, 607
Kurtz, D. W., Martinez, P., & Tripe, P. 1994, MNRAS, 271, 421
Kurtz, D. W., Elkin, V. G., Mathys, G., et al. 2004, in The A-Star Puzzle, ed. J. Zverko, J. Ziznovsky, S. J. Adelman, & W. W. Weiss, IAU Symp., 224, 343
Kuracz, R. L. 1998, http://kurucz.harvard.edu/grids.html
Landstreet, J. D. 1992, A&A Rev., 4, 35
Lanz, T., & Catala, C. 1992, A&A, 257, 663
Leblanc, F., & Monin, D. 2004, in The A-Star Puzzle, ed. J. Zverko, J. Ziznovsky, S. J. Adelman, & W. W. Weiss, IAU Symp., 224, 193
Lueftinger, T., Kuschnig, R., Piskunov, N. E., & Weiss, W. W. 2003, A&A, 406, 1033
Martinez, P., & Kurtz, D. W. 1994, MNRAS, 271, 118
Martinez, P., Kurtz, D. W., & Kauffmann, G. M. 1991, MNRAS, 250, 666
Mathys, G., Hubrig, S., Landstreet, J. D., Lanz, T., & Manfroid, J. 1997, A&AS, 123, 353
Matthews, J. M. 1988, MNRAS, 235, 7P
Michaud, G. 1986, in Hydrogen Deficient Stars and Related Objects, ed. K. Hunger, D. Schoenberner, & N. Kameswara Rao, Ap&SS Library, 128, IAU Colloq., 87, 453
Michaud, G., Tarasick, D., Charland, Y., & Pelletier, C. 1983, ApJ, 269, 239
Moss, D. L., & Taylor, R. J. 1969, MNRAS, 145, 217
North, P., Jaschek, C., Hauck, B., et al. 1997, in Hipparcos - Venice '97, ed. R. M. Bonnet, E. Høg, P. L. Bernacca, L. Emiliani, A. Blaauw, C. Turon, J. Kovalevsky, L. Lindegren, H. Hassan, M. Bouffard, B. Strim, D. Heger, M. A. C. Perryman, & L. Woltjer, ESA SP, 402, 239
Piskunov, N. E., & Rice, J. B. 1993, PASP, 105, 1415
Ryabchikova, T., Kochukhov, O., Kudryavtsev, D., et al. 2006, A&A, 445, L47
Ryabchikova, T. A., Adelman, S. J., Weiss, W. W., & Kuschnig, R. 1997a, A&A, 322, 234
Ryabchikova, T. A., Landstreet, J. D., Gelbmann, M. J., et al. 1997b, A&A, 327, 1137
Ryabchikova, T. A., Savanov, I. S., Hatzes, A. P., Weiss, W. W., & Handler, G. 2000, A&A, 357, 981
Ryabchikova, T. A., Savanov, I. S., Malanushenko, V. P., & Kudryavtsev, D. O. 2001, Astron. Rep., 45, 382
Saio, H. 2005, MNRAS, 360, 1022
Saio, H., & Gautschy, A. 2004, MNRAS, 350, 485
Schaller, G., Schaerer, D., Meynet, G., & Maeder, A. 1992, A&AS, 96, 269
Scuflaire, R., Théado, S., Montalbán, J., et al. 2008, Ap&SS, 316, 83
Seaton, M. J. 2005, MNRAS, 362, L1
Shibahashi, H. 1983, ApJ, 275, L5
Théado, S., & Cunha, M. 2006, Commun. Asteroseismol., 147, 101
Théado, S., Vauclair, S., & Cunha, M. S. 2005, A&A, 443, 627
Wade, G. A., Donati, J.-F., Landstreet, J. D., & Shorlin, S. L. S. 2000, MNRAS, 313, 851
Wade, G. A., Leblanc, F., Ryabchikova, T. A., & Kudryavtsev, D. 2003, in Modelling of Stellar Atmospheres, ed. N. Piskunov, W. W. Weiss, & D. F. Gray, IAU Symp., 210, 7
Weiss, W. W., Ryabchikova, T. A., Kupka, F., et al. 2000, in The Impact of Large-Scale Surveys on Pulsating Star Research, ed. L. Szabados,& D. Kurtz, ASP Conf. Ser., 203, IAU Colloq., 176, 487
Zahn, J.-.P., & Zinn-Justin, J. 1993, Astrophysical Fluid Dynamics, Les Houches Session LXVII
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.
