Convection and Overshoot in Models of γ Doradus and δ Scuti Stars

被引：15

作者：

Lovekin, C. C. ^{[1
,2
]}

Guzik, J. A. ^{[2
,3
]}

机构：

[1] Mt Allison Univ, Phys Dept, Sackville, NB E4L 1C6, Canada

[2] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

[3] Los Alamos Natl Lab, XTD NTA, MS T-082, Los Alamos, NM 87545 USA

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 849卷 / 01期

基金：

加拿大创新基金会; 美国国家科学基金会;

关键词：

stars: rotation; stars: variables: delta Scuti; stars: variables: general; EQUATION-OF-STATE; OSCILLATIONS; FREQUENCIES; EVOLUTION;

D O I：

10.3847/1538-4357/aa8e01

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the pulsation properties of stellar models that are representative of delta Scuti and gamma Doradus variables. We have calculated a grid of stellar models from 1.2 to 2.2M(circle dot), including the effects of both rotation and convective overshoot using MESA, and we investigate the pulsation properties of these models using GYRE. We discuss the observable patterns in the frequency spacing for p modes and the period spacings for g modes. Using the observable patterns in the g mode period spacings, it may be possible to observationally constrain the convective overshoot and rotation of a model. We also calculate the pulsation constant (Q) for all models in our grid and investigate the variation with convective overshoot and rotation. The variation in the Q values of the radial modes can be used to place constraints on the convective overshoot and rotation of stars in this region. As a test case, we apply this method to a sample of 22 High-Amplitude d Scuti stars (HADS) and provide estimates for the convective overshoot of the sample.

引用

页数：7

共 42 条

[11] Cox J. P., 1980, Theory of Stellar Pulsation
[12] Convection-pulsation coupling -: II.: Excitation and stabilization mechanisms in δ Sct and γ Dor stars
Dupret, MA
Grigahcène, A
Garrido, R
Gabriel, M
Scuflaire, R
[J]. ASTRONOMY & ASTROPHYSICS, 2005, 435 (03): : 927 - 939
[13] Theoretical instability strips for δ Scuti and γ Doradus stars
Dupret, MA
Grigahcène, A
Garrido, R
Gabriel, M
Scuflaire, R
[J]. ASTRONOMY & ASTROPHYSICS, 2004, 414 (02): : L17 - L20
[14] Dziembowski W., 1988, Acta Astronomica, V38, P61
[15] L=0, 1, 2, AND 3 PULSATION CONSTANTS FOR EVOLUTIONARY MODELS OF DELTA-SCUTI STARS
FITCH, WS
[J]. ASTROPHYSICAL JOURNAL, 1981, 249 (01) : 218 - 227
[16] Floranes HO, 2005, MON NOT R ASTRON SOC, V356, P671, DOI [10.1111/j.1365-2966.2004.08487.x, 10.1111/j.l365-2966.2004.08487.x]
[17] An in-depth study of HD 174966 with CoRoT photometry and HARPS spectroscopy Large separation as a new observable for δ Scuti stars
Garcia Hernandez, A.
Moya, A.
Michel, E.
Suarez, J. C.
Poretti, E.
Martin-Ruiz, S.
Amado, P. J.
Garrido, R.
Rodriguez, E.
Rainer, M.
Uytterhoeven, K.
Rodrigo, C.
Solano, E.
Rodon, J. R.
Mathias, P.
Rolland, A.
Auvergne, M.
Baglin, A.
Baudin, F.
Catala, C.
Samadi, R.
[J]. ASTRONOMY & ASTROPHYSICS, 2013, 559
[18] Standard solar composition
Grevesse, N
Sauval, AJ
[J]. SPACE SCIENCE REVIEWS, 1998, 85 (1-2) : 161 - 174
[19] HYBRID γ DORADUS-δ SCUTI PULSATORS: NEW INSIGHTS INTO THE PHYSICS OF THE OSCILLATIONS FROM KEPLER OBSERVATIONS
Grigahcene, A.
Antoci, V.
Balona, L.
Catanzaro, G.
Daszynska-Daszkiewicz, J.
Guzik, J. A.
Handler, G.
Houdek, G.
Kurtz, D. W.
Marconi, M.
Monteiro, M. J. P. F. G.
Moya, A.
Ripepi, V.
Suarez, J. -C.
Uytterhoeven, K.
Borucki, W. J.
Brown, T. M.
Christensen-Dalsgaard, J.
Gilliland, R. L.
Jenkins, J. M.
Kjeldsen, H.
Koch, D.
Bernabei, S.
Bradley, P.
Breger, M.
Di Criscienzo, M.
Dupret, M. -A.
Garcia, R. A.
Garcia Hernandez, A.
Jackiewicz, J.
Kaiser, A.
Lehmann, H.
Martin-Ruiz, S.
Mathias, P.
Molenda-Zakowicz, J.
Nemec, J. M.
Nuspl, J.
Paparo, M.
Roth, M.
Szabo, R.
Suran, M. D.
Ventura, R.
[J]. ASTROPHYSICAL JOURNAL LETTERS, 2010, 713 (02) : L192 - L197
[20] Driving the gravity-mode pulsations in γ Doradus variables
Guzik, JA
Kaye, AB
Bradley, PA
Cox, AN
Neuforge, C
[J]. ASTROPHYSICAL JOURNAL, 2000, 542 (01) : L57 - L60

← 1 2 3 4 5 →