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
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.
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页数:7
相关论文
共 42 条
  • [1] Combination frequencies in high-amplitude δ Scuti stars
    Balona, L. A.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2016, 459 (01) : 1097 - 1103
  • [2] Pulsation frequency distribution in δ Scuti stars
    Balona, L. A.
    Daszynska-Daszkiewicz, J.
    Pamyatnykh, A. A.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2015, 452 (03) : 3073 - 3084
  • [3] Low frequencies in Kepler δ Scuti stars
    Balona, L. A.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 437 (02) : 1476 - 1484
  • [4] The Kepler view of γ Doradus stars
    Balona, L. A.
    Guzik, J. A.
    Uytterhoeven, K.
    Smith, J. C.
    Tenenbaum, P.
    Twicken, J. D.
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2011, 415 (04) : 3531 - 3538
  • [5] The Kepler Mission: A wide-field transit search for terrestrial planets
    Basri, G
    Borucki, WJ
    Koch, D
    [J]. NEW ASTRONOMY REVIEWS, 2005, 49 (7-9) : 478 - 485
  • [6] Bohm-Vitense E., 1958, ZAp, V46, P108
  • [7] RESULTS OF A SEARCH FOR γ DOR AND δ SCT STARS WITH THE KEPLER SPACECRAFT
    Bradley, P. A.
    Guzik, J. A.
    Miles, L. F.
    Uytterhoeven, K.
    Jackiewicz, J.
    Kinemuchi, K.
    [J]. ASTRONOMICAL JOURNAL, 2015, 149 (02)
  • [8] Breger M, 1999, ASTRON ASTROPHYS, V341, P151
  • [9] Breger M., 2007, CoAst, V150, P25
  • [10] Breger M., 1990, Delta Scuti Star Newsletter, V2, P13