Asteroseismic analysis of two alpha-enhanced stars KIC 7976303 and KIC 8694723
文献类型：期刊论文
| 作者 | Ge, Z. S.1; Bi, S. L.1; Li, T. D.2; Liu, K.1; Tian, Z. J.1; Yang, W. M.1; Liu, Z. E.1; Yu, J.1 |
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-02-11 |
| 卷号 | 447期号:1页码:680-690 |
| 关键词 | stars: abundances stars: evolution stars: oscillations stars: solar-type |
| 英文摘要 | We intend to use stellar models with and without alpha-enhancement, as well as asteroseismic analysis, to study two alpha-enhanced stars, KIC 7976303 and KIC 8694723. For the alpha-enhanced models, we adopt [alpha/Fe] = 0.2 and 0.4. For the evolved subgiant KIC 7976303 with mixed modes, the alpha-enhanced models fit the observations better than the models without alpha-enhancement, and point to a star with M = 1.20 +/- 0.02M(circle dot) , t = 4.88 +/- 0.08 Gyr, R = 2.04 +/- 0.01 M-circle dot and L = 5.07 +/- 0.05 L-circle dot. For the post turn-off star KIC 8694723, we find that the models fit the observations well in all three cases ([alpha/Fe] = 0.0, 0.2 and 0.4). According to the observed metal abundances, only alpha-enhanced models are used to estimate the stellar parameters, which are M = 1.13 +/- 0.06M(circle dot), t = 5.47 +/- 0.43 Gyr, R = 1.55 +/- 0.13 M-circle dot and L = 3.18 +/- 0.26 L-circle dot. Our alpha-enhanced models indicate that KIC 7976303 has a larger mass and younger age than in previous works based on standard models. Furthermore, the differences of estimated mass and age between the three cases are similar to 0.1M(circle dot) and similar to 0.5-1.3Gyr. These results suggest that we include alpha-enhancement in the modelling of alpha-enhanced stars, such as members of globular clusters and metal-poor stars in the disc and in the halo. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000350272700053 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5728]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 2.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ge, Z. S.,Bi, S. L.,Li, T. D.,et al. Asteroseismic analysis of two alpha-enhanced stars KIC 7976303 and KIC 8694723[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,447(1):680-690. |
| APA | Ge, Z. S..,Bi, S. L..,Li, T. D..,Liu, K..,Tian, Z. J..,...&Yu, J..(2015).Asteroseismic analysis of two alpha-enhanced stars KIC 7976303 and KIC 8694723.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,447(1),680-690. |
| MLA | Ge, Z. S.,et al."Asteroseismic analysis of two alpha-enhanced stars KIC 7976303 and KIC 8694723".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 447.1(2015):680-690. |
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来源：国家天文台
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