ASTEROSEISMIC ANALYSIS OF THE CoRoT TARGET HD 49933
ASTEROSEISMIC ANALYSIS OF THE CoRoT TARGET HD 49933
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CoRoT 目标 HD 49933 的星震分析
DOI:
10.1088/0004-637x/780/2/152
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发表时间:
2013-11
期刊:
影响因子:
--
通讯作者:
Chintarungruangchai, P.
中科院分区:
文献类型:
--
作者:
Tan, Xiaoyan;He, Xin;Wu, Yaqian;Chintarungruangchai, P.
The frequency ratios r10 and r01 of HD 49933 exhibit an increase at high frequencies. This behavior also exists in the ratios of other stars, which is considered to result from the low signal-to-noise ratio and the larger linewidth at the high-frequency end and could not be predicted by stellar models in previous work. Our calculations show that the behavior not only can be reproduced by stellar models, but can be predicted by asymptotic formulas of the ratios. The frequency ratios of the Sun, too, can be reproduced well by the asymptotic formulas. The increased behavior derives from the fact that the gradient of mean molecular weight at the bottom of the radiative region hinders the propagation of p-modes, while the hindrance does not exist in the convective core. This behavior should exist in the ratios of stars with a large convective core. The characteristic of the ratios at high frequencies provides a strict constraint on stellar models and aids in determining the size of the convective core and the extent of overshooting. Observational constraints point to a star with M = 1.28 ± 0.01 M☉, R = 1.458 ± 0.005 R☉, t = 1.83 ± 0.1 Gyr, rcc = 0.16 ± 0.02 R☉, α = 1.85 ± 0.05, and δov =0.6 ± 0.2 for HD 49933.
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影响因子:
6.5
作者:
L. Bigot;D. Mourard;P. Bério;F. Th'evenin;R. Ligi;I. Tallon-Bosc;O. Chesneau;O. Delaa;N. Nardetto;K. Perraut;P. Stee;T. Boyajian;P. Morel;B. Pichon;P. Kervella;F. Schmider;H. Mcalister;T. Brummelaar;S. Ridgway;J. Sturmann;L. Sturmann;N. Turner;C. Farrington;P. J. Goldfinger
通讯作者:
L. Bigot;D. Mourard;P. Bério;F. Th'evenin;R. Ligi;I. Tallon-Bosc;O. Chesneau;O. Delaa;N. Nardetto;K. Perraut;P. Stee;T. Boyajian;P. Morel;B. Pichon;P. Kervella;F. Schmider;H. Mcalister;T. Brummelaar;S. Ridgway;J. Sturmann;L. Sturmann;N. Turner;C. Farrington;P. J. Goldfinger
DOI:
10.1016/0364-9229(79)90018-6
发表时间:
1989-08
期刊:
--
影响因子:
--
作者:
Y. Osaki;H. Ando;W. Unno
通讯作者:
Y. Osaki;H. Ando;W. Unno
DOI:
10.1111/j.1365-2966.2006.10912.x
发表时间:
2005-12
影响因子:
4.8
作者:
A. Mazumdar;S. Basu;B. L. Collier;P. Demarque
通讯作者:
A. Mazumdar;S. Basu;B. L. Collier;P. Demarque
DOI:
10.1086/341894
发表时间:
2002-09
期刊:
The Astrophysical Journal
影响因子:
--
作者:
F. Rogers;A. Nayfonov
通讯作者:
F. Rogers;A. Nayfonov
DOI:
10.1086/173735
发表时间:
1994-02
期刊:
The Astrophysical Journal
影响因子:
--
作者:
D. Guenther
通讯作者:
D. Guenther