SDSS-IV MaStar: theoretical atmospheric parameters for the MaNGA stellar library
SDSS-IV MaStar: theoretical atmospheric parameters for the MaNGA stellar library
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SDSS-IV MaStar：MaNGA 恒星库的理论大气参数
DOI：
10.1093/mnras/stab3263
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发表时间：
2021
影响因子：
4.8
通讯作者：
Holtzman, Jon A.
中科院分区：
文献类型：
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作者：
Hill, Lewis;Thomas, Daniel;Maraston, Claudia;Yan, Renbin;Neumann, Justus;Lundgren, Andrew;Lazarz, Daniel;Chen, Yan-Ping;Cappellari, Michele;Holtzman, Jon A.
我们计算了基本的恒星参数，有效温度，表面重力和铁丰度- teff， log， [Fe/H] -用于APO （MaNGA）恒星库（MaStar）绘制附近星系的最终版本，包含24290颗独特恒星的59 266次访问光谱，中等分辨率（R ~ 1800）和高信噪比（中位数= 96）。我们使用全光谱拟合代码pPXF对MARCS和BOSZ-ATLAS9模型大气的理论光谱与观测到的MaStar光谱进行拟合。我们进一步采用贝叶斯方法，使用马尔可夫链蒙特卡罗（MCMC）技术来映射参数空间并获得不确定性。最初在本文中，我们将MaStar观测与gaiaphotometry交叉匹配，这使我们能够根据恒星演化设置可靠的先验并识别异常值。在确定参数的同时，我们计算了相应的恒星种群模型，以测试每个恒星演化阶段参数的可靠性。我们通过确定标准恒星（如太阳和织女星）的参数，并将我们的参数与高分辨率光谱（APOGEE和SEGUE）和低分辨率匹配模板（LAMOST）的文献中确定的参数进行比较，进一步评估我们的程序。考虑到不同的方法和文献调查的信噪比，比较在所有情况下都是有利的。我们最终的MaStar参数目录涵盖以下范围：2592≤Teff≤32 983 K；−0.7≤logg≤5.4指数；−2.9≤[Fe/H]≤1.0指数，并将在2021年12月最后一次SDSS-IV数据发布时提供。
We calculate the fundamental stellar parameters effective temperature, surface gravity, and iron abundance –Teff, logg, [Fe/H] – for the final release of the Mapping Nearby Galaxies at APO (MaNGA) Stellar Library (MaStar), containing 59 266 per-visit-spectra for 24 290 unique stars at intermediate resolution (R∼ 1800) and high S/N (median = 96). We fit theoretical spectra from model atmospheres by both MARCS and BOSZ-ATLAS9 to the observed MaStar spectra, using the full spectral fitting code pPXF. We further employ a Bayesian approach, using a Markov Chain Monte Carlo (MCMC) technique to map the parameter space and obtain uncertainties. Originally in this paper, we cross match MaStar observations withGaiaphotometry, which enable us to set reliable priors and identify outliers according to stellar evolution. In parallel to the parameter determination, we calculate corresponding stellar population models to test the reliability of the parameters for each stellar evolutionary phase. We further assess our procedure by determining parameters for standard stars such as the Sun and Vega and by comparing our parameters with those determined in the literature from high-resolution spectroscopy (APOGEE and SEGUE) and from lower resolution matching template (LAMOST). The comparisons, considering the different methodologies and S/N of the literature surveys, are favourable in all cases. Our final parameter catalogue for MaStar cover the following ranges: 2592 ≤Teff≤ 32 983 K; −0.7 ≤ logg≤ 5.4 dex; −2.9 ≤ [Fe/H] ≤ 1.0 dex and will be available with the last SDSS-IV Data Release, in 2021 December.