Non-LTE Analyses of High-resolution H-band Spectra. III. Neutral and Singly Ionized Calcium

doi:10.3847/1538-4357/ab2dfd

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	Non-LTE Analyses of High-resolution H-band Spectra. III. Neutral and Singly Ionized Calcium
	Zhou,Ze-Ming 1,2,3,4; Pan,Kaike 3,4; Shi,Jian-Rong 1,2; Zhang,Jun-Bo 2; Liu,Chao 1,2
刊名	The Astrophysical Journal
	2019-08-14
卷号	881 期号:1
关键词	line: formation stars: abundances stars: atmospheres
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab2dfd
英文摘要	Abstract A calcium atomic model is updated using collisional rates from new quantum-mechanical computations. We investigated the reliability of the model atom and the non-local thermodynamic equilibrium (NLTE or non-LTE) effects on the formation of Ca i lines in both optical and H bands. NLTE and local thermodynamical equilibrium calcium abundances of 13 sample stars are derived from high-resolution and high signal-to-noise ratio optical spectra and the Apache Point Observatory Galactic Evolution Experiment (APOGEE) data. The results suggest that the updated calcium atomic model is appropriate for studying the formation of H-band calcium lines because our NLTE analyses not only reduce the line-to-line spread of derived abundances, but also lead to consistent optical-line-based and H-band-line-based abundances with a difference of ?0.009?±?0.035 dex and a calcium ionization balance between Ca i and Ca ii. In the stellar fundamental parameter space that our sample stars cover, NLTE corrections for H-band Ca i lines are small, within 0.03 dex. Even in the extreme cases of the APOGEE data, the NLTE corrections on selected H-band Ca i lines are within 0.1 dex.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-881-1-AB2DFD
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/27378]
专题	中国科学院国家天文台
作者单位	1.School of Astronomy and Space Science, University of Chinese Academy of Sciences, No. 380 Huaibei vil., Huairou District, Beijing 100049, People’s Republic of China 2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China; sjr@bao.ac.cn 3.Astronomy Department, New Mexico State University, Las Cruces, NM 88003, USA 4.Apache Point Observatory, Sunspot, NM 88349, USA; kpan@apo.nmsu.edu
推荐引用方式 GB/T 7714	Zhou,Ze-Ming,Pan,Kaike,Shi,Jian-Rong,et al. Non-LTE Analyses of High-resolution H-band Spectra. III. Neutral and Singly Ionized Calcium[J]. The Astrophysical Journal,2019,881(1).
APA	Zhou,Ze-Ming,Pan,Kaike,Shi,Jian-Rong,Zhang,Jun-Bo,&Liu,Chao.(2019).Non-LTE Analyses of High-resolution H-band Spectra. III. Neutral and Singly Ionized Calcium.The Astrophysical Journal,881(1).
MLA	Zhou,Ze-Ming,et al."Non-LTE Analyses of High-resolution H-band Spectra. III. Neutral and Singly Ionized Calcium".The Astrophysical Journal 881.1(2019).