TY - JOUR
T1 - APOGEE Data Releases 13 and 14
T2 - Data and Analysis
AU - Holtzman, Jon A.
AU - Hasselquist, Sten
AU - Shetrone, Matthew
AU - Cunha, Katia
AU - Prieto, Carlos Allende
AU - Anguiano, Borja
AU - Bizyaev, Dmitry
AU - Bovy, Jo
AU - Casey, Andrew
AU - Edvardsson, Bengt
AU - Johnson, Jennifer A.
AU - Jönsson, Henrik
AU - Meszaros, Szabolcs
AU - Smith, Verne V.
AU - Sobeck, Jennifer
AU - Zamora, Olga
AU - Chojnowski, S. Drew
AU - Fernandez-Trincado, Jose
AU - Hernandez, Anibal Garcia
AU - Majewski, Steven R.
AU - Pinsonneault, Marc
AU - Souto, Diogo
AU - Stringfellow, Guy S.
AU - Tayar, Jamie
AU - Troup, Nicholas
AU - Zasowski, Gail
PY - 2018/9/1
Y1 - 2018/9/1
N2 - The data and analysis methodology used for the SDSS/APOGEE Data Releases 13 and 14 are described, highlighting differences from the DR12 analysis presented in Holtzman et al. Some improvement in the handling of telluric absorption and persistence is demonstrated. The derivation and calibration of stellar parameters, chemical abundances, and respective uncertainties are described, along with the ranges over which calibration was performed. Some known issues with the public data related to the calibration of the effective temperatures (DR13), surface gravity (DR13 and DR14), and C and N abundances for dwarfs (DR13 and DR14) are highlighted. We discuss how results from a data-driven technique, The Cannon, are included in DR14 and compare those with results from the APOGEE Stellar Parameters and Chemical Abundances Pipeline. We describe how using The Cannon in a mode that restricts the abundance analysis of each element to regions of the spectrum with known features from that element leads to Cannon abundances can lead to significantly different results for some elements than when all regions of the spectrum are used to derive abundances.
AB - The data and analysis methodology used for the SDSS/APOGEE Data Releases 13 and 14 are described, highlighting differences from the DR12 analysis presented in Holtzman et al. Some improvement in the handling of telluric absorption and persistence is demonstrated. The derivation and calibration of stellar parameters, chemical abundances, and respective uncertainties are described, along with the ranges over which calibration was performed. Some known issues with the public data related to the calibration of the effective temperatures (DR13), surface gravity (DR13 and DR14), and C and N abundances for dwarfs (DR13 and DR14) are highlighted. We discuss how results from a data-driven technique, The Cannon, are included in DR14 and compare those with results from the APOGEE Stellar Parameters and Chemical Abundances Pipeline. We describe how using The Cannon in a mode that restricts the abundance analysis of each element to regions of the spectrum with known features from that element leads to Cannon abundances can lead to significantly different results for some elements than when all regions of the spectrum are used to derive abundances.
KW - methods: data analysis
KW - stars: abundances
KW - techniques: spectroscopic
UR - http://www.scopus.com/inward/record.url?scp=85053105183&partnerID=8YFLogxK
U2 - 10.3847/1538-3881/aad4f9
DO - 10.3847/1538-3881/aad4f9
M3 - Article
AN - SCOPUS:85053105183
SN - 0004-6256
VL - 156
JO - The Astronomical Journal
JF - The Astronomical Journal
IS - 3
M1 - 125
ER -