arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.05537astro-ph.GA
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来自SDSS数据发布16的APOGEE数据和谱分析:包括来自APOGE-South的第一批结果的七年观测

APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South

Henrik Jönsson, Jon A. Holtzman, Carlos Allende Prieto, Katia Cunha, D. A. García-Hernández, Sten Hasselquist, Thomas Masseron, Yeisson Osorio, Matthew Shetrone… 展开作者

Henrik Jönsson, Jon A. Holtzman, Carlos Allende Prieto, Katia Cunha, D. A. García-Hernández, Sten Hasselquist, Thomas Masseron, Yeisson Osorio, Matthew Shetrone, Verne Smith, Guy S. Stringfellow, Dmitry Bizyaev, Bengt Edvardsson, Steven R. Majewski, Szabolcs Mészáros, Diogo Souto, Olga Zamora, Rachael L. Beaton, Jo Bovy, John Donor, Marc H. Pinsonneault, Vijith Jacob Poovelil, Jennifer Sobeck

摘要:

描述了高分辨率近红外APOGEE-2/SDSS-IV调查数据发布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包含约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米杜邦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。所有的数据都经过了重新整理和重新分析,得到了437445颗恒星的473307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,估计的不确定性的导出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网页中提供的链接下载简化光谱以及分析结果。

英文摘要:

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.

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