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Stellar Parameters for the First Release of the MaSTar Library: An Empirical Approach
The Astrophysical Journal ( IF 4.9 ) Pub Date : 2020-08-12 , DOI: 10.3847/1538-4357/ab9f35
Yan-Ping Chen 1, 2 , Renbin Yan 3 , Claudia Maraston 4 , Daniel Thomas 4 , Guy S. Stringfellow 5 , Dmitry Bizyaev 6, 7 , Joseph D Gelfand 1, 2 , Timothy C. Beers 8 , Jos G. Fernndez-Trincado 9 , Daniel Lazarz 3 , Lewis Hill 4 , Niv Drory 10 , Keivan G. Stassun 11
Affiliation  

We report the stellar atmospheric parameters for 7503 spectra contained in the first release of the MaNGA stellar library (MaStar) in SDSS DR15. The first release of MaStar contains 8646 spectra measured from 3321 unique stars, each covering the wavelength range 3622 A to 10354 A with a resolving power of $R \sim$ 1800. In this work, we first determined the basic stellar parameters: effective temperature ($\rm T_{eff}$), surface gravity ($\log g$), and metallicity ($\rm[Fe/H]$), which best fit the data using an empirical interpolator based on the Medium-resolution Isaac Newton Telescope library of empirical spectra (MILES), as implemented by the University of Lyon Spectroscopic analysis Software (Koleva et al. 2008, ULySS) package. While we analyzed all 8646 spectra from the first release of MaStar, since MaStar has a wider parameter-space coverage than MILES, not all of these fits are robust. In addition, not all parameter regions covered by MILES yield robust results, likely due to the non-uniform coverage of the parameter space by MILES. We tested the robustness of the method using the MILES spectra itself and identified a proxy based on the local density of the training set. With this proxy, we identified 7503 MaStar spectra with robust fitting results. They cover the range from 3179K to 20,517K in effective temperature ($\rm T_{eff}$), from 0.40 to 5.0 in surface gravity ($\log g$), and from $-$2.49 to $+$0.73 in metallicity ($\rm[Fe/H]$).

中文翻译:

MaSTar 库首次发布的恒星参数:一种实证方法

我们报告了SDSS DR15 中第一版MaNGA 恒星库(MaStar) 中包含的7503 光谱的恒星大气参数。MaStar 的第一个版本包含从 3321 颗独特恒星测量的 8646 个光谱,每个光谱覆盖 3622 A 到 10354 A 的波长范围,分辨率为 $R\sim$1800。在这项工作中,我们首先确定了基本恒星参数:有效温度($\rm T_{eff}$)、表面重力 ($\log g$) 和金属丰度 ($\rm[Fe/H]$),使用基于中等分辨率的经验插值器最适合数据艾萨克牛顿望远镜经验光谱库 (MILES),由里昂大学光谱分析软件 (Koleva et al. 2008, ULySS) 包实现。虽然我们分析了第一版 MaStar 的所有 8646 光谱,由于 MaStar 的参数空间覆盖范围比 MILES 更广,因此并非所有这些拟合都是稳健的。此外,并非 MILES 覆盖的所有参数区域都能产生稳健的结果,这可能是由于 MILES 对参数空间的覆盖不均匀。我们使用 MILES 谱本身测试了该方法的稳健性,并根据训练集的局部密度确定了一个代理。使用此代理,我们确定了 7503 个具有稳健拟合结果的 MaStar 光谱。它们的有效温度范围从 3179K 到 20,517K($\rm T_{eff}$),表面重力从 0.40 到 5.0($\log g$),金属丰度从 $-$2.49 到 $+$0.73( $\rm[Fe/H]$)。我们使用 MILES 谱本身测试了该方法的稳健性,并根据训练集的局部密度确定了一个代理。使用此代理,我们确定了 7503 个具有稳健拟合结果的 MaStar 光谱。它们的有效温度范围从 3179K 到 20,517K($\rm T_{eff}$),表面重力从 0.40 到 5.0($\log g$),金属丰度从 $-$2.49 到 $+$0.73( $\rm[Fe/H]$)。我们使用 MILES 谱本身测试了该方法的稳健性,并根据训练集的局部密度确定了一个代理。使用此代理,我们确定了 7503 个具有稳健拟合结果的 MaStar 光谱。它们的有效温度范围从 3179K 到 20,517K($\rm T_{eff}$),表面重力从 0.40 到 5.0($\log g$),金属丰度从 $-$2.49 到 $+$0.73( $\rm[Fe/H]$)。
更新日期:2020-08-12
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