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 (2015). 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 (Casey 2016), are included in DR14, and compare those with results from the APOGEE Stellar Parameters and Chemical Abundances Pipeline (ASPCAP). 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.
Cite
@article{arxiv.1807.09773,
title = {APOGEE Data Releases 13 and 14: Data and Analysis},
author = {Jon A. Holtzman and Sten Hasselquist and Matthew Shetrone and Katia Cunha and Carlos Allende Prieto and Borja Anguiano and Dmitry Bizyaev and Jo Bovy and Andrew Casey and Bengt Edvardsson and Jennifer A. Johnson and Henrik Jonsson and Szabolcs Meszaros and Verne V. Smith and Jennifer Sobeck and Olga Zamora and S. Drew Chojnowski and Jose Fernandez-Trincado and Anibal Garcia Hernandez and Steven R. Majewski and Marc Pinsonneault and Diogo Souto and Guy S. Stringfellow and Jamie Tayar and Nicholas Troup and Gail Zasowski},
journal= {arXiv preprint arXiv:1807.09773},
year = {2018}
}
Comments
31 pages, 31 figures; Astronomical Journal in press