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

Jönsson, Henrik LU orcid ; Holtzman, Jon A. LU ; Prieto, Carlos Allende ; Cunha, Katia ; García-Hernández, D. A. ; Hasselquist, Sten ; Masseron, Thomas ; Osorio, Yeisson ; Shetrone, Matthew and Smith, Verne , et al. (2020) In The Astronomical Journal 160(3).
Abstract

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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Astronomical Journal
volume
160
issue
3
article number
120
publisher
IOP Publishing
external identifiers
  • scopus:85090298452
ISSN
0004-6256
DOI
10.3847/1538-3881/aba592
language
English
LU publication?
yes
id
2b071819-5978-467b-82b6-7b4ef3ee64ce
date added to LUP
2020-12-22 10:37:23
date last changed
2024-04-17 22:22:09
@article{2b071819-5978-467b-82b6-7b4ef3ee64ce,
  abstract     = {{<p>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. </p>}},
  author       = {{Jönsson, Henrik and Holtzman, Jon A. and Prieto, Carlos Allende and Cunha, Katia and García-Hernández, D. A. and Hasselquist, Sten and Masseron, Thomas and Osorio, Yeisson and Shetrone, Matthew and Smith, Verne and Stringfellow, Guy S. and Bizyaev, Dmitry and Edvardsson, Bengt and Majewski, Steven R. and Mészáros, Szabolcs and Souto, Diogo and Zamora, Olga and Beaton, Rachael L. and Bovy, Jo and Donor, John and Pinsonneault, Marc H. and Poovelil, Vijith Jacob and Sobeck, Jennifer}},
  issn         = {{0004-6256}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{IOP Publishing}},
  series       = {{The Astronomical Journal}},
  title        = {{APOGEE Data and Spectral Analysis from SDSS Data Release 16 : Seven Years of Observations including First Results from APOGEE-South}},
  url          = {{http://dx.doi.org/10.3847/1538-3881/aba592}},
  doi          = {{10.3847/1538-3881/aba592}},
  volume       = {{160}},
  year         = {{2020}},
}