Impact of the convective mixing-length parameter alpha on stellar metallicity
文献类型：期刊论文
| 作者 | Song, N.1,5 ; Alexeeva, S.1; Sitnova, T.4; Wang, L.2,3; Grupp, F.2,3; Zhao, G.1,5
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2020-04-01 |
| 卷号 | 635页码:10 |
| 关键词 | stars: atmospheres stars: abundances stars: fundamental parameters convection line: profiles |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/201937110 |
| 英文摘要 | Context. Mixing-length theory is used to treat stellar convection. As a simulation in one-dimensional stellar atmospheres models, the mixing-length parameter alpha is calibrated from the Sun and then applied to other stars. However, there is no strong evidence to suggest that alpha should be the same for stars of different evolutionary stages.Aims. We evaluate the impact of the alpha value on the metallicity of different types of stars and investigate the correlation between the metallicity discrepancy (Delta [Fe/H]) and stellar parameters (T-eff, log g).Methods. We selected ten well-studied field stars and one open cluster of nine members for which high-resolution and high signal-to-noise spectra are available. The model atmospheres were calculated with the code MAFAGS-OS. We derived iron abundances from FeI and FeII lines both under local thermodynamic equilibrium and non-LTE conditions using a spectrum synthesis method. After deriving [Fe/H] for each line, we calculated Delta [Fe/H] with two different alpha values, fixed solar-calibrated alpha, and alpha obtained for each star individually. Finally, we investigated the correlation between Delta [Fe/H] caused by revised alpha with stellar parameters.Results. For FGK dwarf stars, the Delta [Fe/H] caused by the alpha correction is less than 0.02 dex, while for turn-off and giant stars, the Delta [Fe/H] values are no more than 0.03 dex, which are lower than typical uncertainties in metallicity. For main-sequence stars, Delta [Fe/H] versus T-eff and Delta [Fe/H] versus log g are well fit by linear relations. |
| WOS关键词 | MULTILEVEL RADIATIVE-TRANSFER ; SAMPLING MODEL ATMOSPHERES ; LAMBDA ITERATION METHOD ; COOL DWARF STARS ; TURBULENT CONVECTION ; INELASTIC PROCESSES ; SURFACE GRAVITIES ; MAFAGS-OS ; IMPROVEMENTS ; SIMULATIONS |
| 资助项目 | National Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11890694] ; National Natural Science Foundation of China[11773033] ; National Key R&D Program of China[2019YFA0405502] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000526212100001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/56133]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Song, N. |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China 2.Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany 3.Univ Sternwarte Mumchen, Scheinerstr 1, D-81679 Munich, Germany 4.Russian Acad Sci, Inst Astron, Moscow 119017, Russia 5.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Song, N.,Alexeeva, S.,Sitnova, T.,et al. Impact of the convective mixing-length parameter alpha on stellar metallicity[J]. ASTRONOMY & ASTROPHYSICS,2020,635:10. |
| APA | Song, N.,Alexeeva, S.,Sitnova, T.,Wang, L.,Grupp, F.,&Zhao, G..(2020).Impact of the convective mixing-length parameter alpha on stellar metallicity.ASTRONOMY & ASTROPHYSICS,635,10. |
| MLA | Song, N.,et al."Impact of the convective mixing-length parameter alpha on stellar metallicity".ASTRONOMY & ASTROPHYSICS 635(2020):10. |
入库方式： OAI收割
来源：国家天文台
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