Stellar parameters, extinction, and distances for stars in SMSS DR2 by SPar method

In this study, we present stellar parameters, including effective temperature (Teff), metallicities (FeH), absolute magnitudes (M_{G}), distances (d), and reddening values (E_{G_{BP},G_{RP}}), for a sample of 141 million stars from the SkyMapper Southern Survey (SMSS) using the SPar algorithm. This algorithm employs a fitting procedure to match the multi-band stellar photometries and derive the stellar parameters (Teff, FeH, M_G, d and E_{G_{BP},G_{RP}}) on an individual star basis, following the approach outlined in our previous work. By extending our investigation to include stars in both high and low Galactic latitudes, this study successfully corrects for extinction in stars located in low Galactic latitudes, enabling precise determination of their stellar parameters.

本研究基于SPar算法，为来自SkyMapper南天巡天（SkyMapper Southern Survey, SMSS）的1.41亿颗恒星样本提供恒星参数，包括有效温度（effective temperature, Teff）、金属丰度（metallicities, FeH）、绝对星等（absolute magnitudes, M_G）、距离（d）以及红化值（E_{G_{BP},G_{RP}}）。该算法采用拟合流程匹配多波段恒星测光数据，并基于单颗恒星独立推导恒星参数（Teff、FeH、M_G、d与E_{G_{BP},G_{RP}}），遵循我们此前研究中提出的方法。本研究将观测样本拓展至高、低银道纬度区域，成功校正了低银纬恒星的消光效应，实现了其恒星参数的精准测定。