论文标题
SDSS数据释放16:七年观察结果的垂直数据和光谱分析,包括Apogee-South的首次结果
APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
论文作者
论文摘要
描述了高分辨率近红外Apogee-2/SDSS-IV调查中数据版本16(DR16; 2019年12月)中的光谱分析和数据产品。与以前的脱哥式数据发布(DR14; 2017年7月)相比,Apogee DR16包括大约200000个新的恒星光谱,其中100000个来自辣椒的Las Campanas campanas天文台的2.5 m du Pont望远镜上安装在2.5 m du Pont望远镜上的新南部座椅乐器。 DR16包括截至2018年8月的所有数据,包括先前数据发行中发布的数据。使用最新的管道对所有数据进行了重新降低和重新分析,总共473307光谱为437445星。该版本的分析方法的变化包括但不限于使用MARCS模型大气来计算分析中使用的整个合成光谱的主要主要网格,这是一种由于模型不连续的模型大气而在网格中填充“孔”的新方法,以及用于连续性归一化的新方案。首次包括中子捕获元素CE的丰度。已经应用了一种新的方案,用于使用具有多个观察结果的恒星估算衍生数量的不确定性,并且现在提供了矮星的表面重力值的校准值。与DR14相比,该版本得出的径向速度更匹配Gaia DR2数据库中的径向速度,并且可以看到对最酷巨人的光谱分析的明显改善。可以使用SDSS DR16网页中提供的链接下载降低的光谱以及分析结果。
The spectral analysis and data products in Data Release 16 (DR16; December 2019) from the high-resolution near-infrared APOGEE-2/SDSS-IV survey are described. Compared to the previous APOGEE data release (DR14; July 2017), APOGEE DR16 includes about 200000 new stellar spectra, of which 100000 are from a new southern APOGEE instrument mounted on the 2.5 m du Pont telescope at Las Campanas Observatory in Chile. DR16 includes all data taken up to August 2018, including data released in previous data releases. All of the data have been re-reduced and re-analyzed using the latest pipelines, resulting in a total of 473307 spectra of 437445 stars. Changes to the analysis methods for this release include, but are not limited to, the use of MARCS model atmospheres for calculation of the entire main grid of synthetic spectra used in the analysis, a new method for filling "holes" in the grids due to unconverged model atmospheres, and a new scheme for continuum normalization. Abundances of the neutron capture element Ce are included for the first time. A new scheme for estimating uncertainties of the derived quantities using stars with multiple observations has been applied, and calibrated values of surface gravities for dwarf stars are now supplied. Compared to DR14, the radial velocities derived for this release more closely match those in the Gaia DR2 data base, and a clear improvement in the spectral analysis of the coolest giants can be seen. The reduced spectra as well as the result of the analysis can be downloaded using links provided in the SDSS DR16 web page.