APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
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DOI：
10.3847/1538-3881/aba592
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发表时间：
2020-07
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通讯作者：
H. Jönsson;J. Holtzman;C. Prieto;K. Cunha;D. A. Garc'ia-Hern'andez;S. Hasselquist;T. Masseron;Y. Osorio;M. Shetrone;V. Smith;G. Stringfellow;D. Bizyaev;B. Edvardsson;S. Majewski;S. M'esz'aros;D. Souto;O. Zamora;R. Beaton;J. Bovy;J. Donor;M. Pinsonneault;Vijith Jacob Poovelil;J. Sobeck
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作者：
H. Jönsson;J. Holtzman;C. Prieto;K. Cunha;D. A. Garc'ia-Hern'andez;S. Hasselquist;T. Masseron;Y. Osorio;M. Shetrone;V. Smith;G. Stringfellow;D. Bizyaev;B. Edvardsson;S. Majewski;S. M'esz'aros;D. Souto;O. Zamora;R. Beaton;J. Bovy;J. Donor;M. Pinsonneault;Vijith Jacob Poovelil;J. Sobeck
描述了来自高分辨率近红外Apache Point Observatory Galactic Evolution Experiment（APOGEE）-2/Sloan Digital Sky Survey（SDSS）-IV调查的数据发布16（DR 16; 2019年12月）中的光谱分析和数据产品。与之前的APOGEE数据发布（DR 14; 2017年7月）相比，APOGEE DR 16包括大约20万个新的恒星光谱，其中10万个来自安装在智利Las Campanas天文台2.5米du蓬特望远镜上的新的南部APOGEE仪器。DR 16包括截至2018年8月的所有数据，包括之前发布的数据。所有的数据都使用最新的管道进行了重新简化和重新分析，总共得到了437，445颗恒星的473，307个光谱。此版本分析方法的变更包括但不限于使用MARCS模型大气计算分析中使用的合成光谱的整个主网格，填充网格中因模型大气不收敛而产生的“洞”的新方法，以及连续统归一化的新方案。中子俘获元素Ce的丰度首次被包括在内。一个新的计划，估计不确定性的衍生量使用的恒星与多个观测已被应用，并校准值的矮星的表面重力现在提供。与DR 14相比，这次发布的径向速度更接近盖亚DR 2数据库中的径向速度，并且可以看到最冷巨星的光谱分析有明显的改进。可使用SDSS DR 16网页上提供的链接下载简化光谱以及分析结果。
The spectral analysis and data products in Data Release 16 (DR16; 2019 December) from the high-resolution near-infrared Apache Point Observatory Galactic Evolution Experiment (APOGEE)-2/Sloan Digital Sky Survey (SDSS)-IV survey are described. Compared to the previous APOGEE data release (DR14; 2017 July), APOGEE DR16 includes about 200,000 new stellar spectra, of which 100,000 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 2018 August, 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 473,307 spectra of 437,445 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 database, 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 on the SDSS DR16 web page.