Neon Abundances of B Stars in the Solar Neighborhood
文献类型：期刊论文
| 作者 | Alexeeva,Sofya2; Chen,Tianxiang3; Ryabchikova,Tatyana4; Shi,Weibin3; Sadakane,Kozo5; Nishimura,Masayoshi1; Zhao,Gang2
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2020-06-01 |
| 卷号 | 896期号:1 |
| 关键词 | B stars Early-type stars Solar neighborhood Stellar abundances Chemical abundances Solar abundances |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab9306 |
| 英文摘要 | Abstract We constructed a comprehensive model atom for Ne i–Ne ii using the most-up-to-date atomic data available and evaluated the nonlocal thermodynamic equilibrium (NLTE) line formation for Ne i and Ne ii in classical 1D models representing the atmospheres of B-type stars. We find that the large NLTE strengthening of the Ne i lines corresponding to the 2p53p–2p53s transition array occurs due to extremely small photoionization cross sections of the 2p53s levels that lead to strong overpopulation of these levels relative to their LTE populations. The deviations from LTE for most Ne ii lines are small and do not exceed 0.11?dex in absolute value. We analyzed 20 lines of Ne i and 13 lines of Ne ii for 24 B-type stars in the temperature range of 10,400?≤? ?≤?33,400 K. For five stars, the NLTE leads to consistent abundances of Ne i and Ne ii, while the difference in LTE abundance can reach up to 0.50?dex. Using the experimental oscillator strengths recently measured by Piracha et al. leads to smaller line-by-line scatter for most of the investigated stars. The average neon abundance in 24 B-type stars in the solar neighborhood is 8.02?±?0.05. This value may provide indirect constraints on the solar photospheric neon abundance. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-896-1-AB9306 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/63539]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.2–6, Nishiyama Maruo, Yawata shi, Kyoto 614 8353, Japan 2.Key Lab of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang, Beijing 100102, People's Republic of China; alexeeva@nao.cas.cn, gzhao@nao.cas.cn 3.Shandong Provincial Key Laboratory of Optical Astronomy and Solar Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, People's Republic of China 4.Institute of Astronomy of the RAS, Pyatnitskaya 48, 119017, Moscow, Russia 5.Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara shi, Osaka 582 8582, Japan |
| 推荐引用方式 GB/T 7714 | Alexeeva,Sofya,Chen,Tianxiang,Ryabchikova,Tatyana,et al. Neon Abundances of B Stars in the Solar Neighborhood[J]. The Astrophysical Journal,2020,896(1). |
| APA | Alexeeva,Sofya.,Chen,Tianxiang.,Ryabchikova,Tatyana.,Shi,Weibin.,Sadakane,Kozo.,...&Zhao,Gang.(2020).Neon Abundances of B Stars in the Solar Neighborhood.The Astrophysical Journal,896(1). |
| MLA | Alexeeva,Sofya,et al."Neon Abundances of B Stars in the Solar Neighborhood".The Astrophysical Journal 896.1(2020). |
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来源：国家天文台
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