Estimating stellar atmospheric parameters, absolute magnitudes and elemental abundances from the LAMOST spectra with Kernel-based principal component analysis
| Autor: | Wei Zhang, Zhi-Ying Huo, Jianrong Shi, Xiaowei Liu, Juanjuan Ren, Yang Huang, Yong-Heng Zhao, Yue-Fei Wang, Jiali Wang, Bingqiu Chen, A-Li Luo, Yong-Hui Hou, Chun Wang, Mao-Sheng Xiang, Yong Zhang, Hua-Wei Zhang, Jing Li, Jian Zhang, Haibo Yuan |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Absolute magnitude 010308 nuclear & particles physics Metallicity FOS: Physical sciences Astronomy and Astrophysics Astrophysics Effective temperature Surface gravity 01 natural sciences Spectral line LAMOST Stars Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science 0103 physical sciences Galaxy formation and evolution 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 464:3657-3678 |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stw2523 |
| Popis: | Accurate determination of stellar atmospheric parameters and elemental abundances is crucial for Galactic archeology via large-scale spectroscopic surveys. In this paper, we estimate stellar atmospheric parameters -- effective temperature T_{\rm eff}, surface gravity log g and metallicity [Fe/H], absolute magnitudes M_V and M_{Ks}, {\alpha}-element to metal (and iron) abundance ratio [{\alpha}/M] (and [{\alpha}/Fe]), as well as carbon and nitrogen abundances [C/H] and [N/H] from the LAMOST spectra with amultivariate regressionmethod based on kernel-based principal component analysis, using stars in common with other surveys (Hipparcos, Kepler, APOGEE) as training data sets. Both internal and external examinations indicate that given a spectral signal-to-noise ratio (SNR) better than 50, our method is capable of delivering stellar parameters with a precision of ~100K for Teff, ~0.1 dex for log g, 0.3 -- 0.4mag for M_V and M_{Ks}, 0.1 dex for [Fe/H], [C/H] and [N/H], and better than 0.05 dex for [{\alpha}/M] ([{\alpha}/Fe]). The results are satisfactory even for a spectral SNR of 20. The work presents first determinations of [C/H] and [N/H] abundances from a vast data set of LAMOST, and, to our knowledge, the first reported implementation of absolute magnitude estimation directly based on the observed spectra. The derived stellar parameters for millions of stars from the LAMOST surveys will be publicly available in the form of value-added catalogues. Comment: 23 pages, 23 figures; MNRAS accepted |
| Databáze: | OpenAIRE |
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