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APOGEE Data Releases 13 and 14: Data and Analysis
New Mexico State Univ, Las Cruces, NM, USA.
New Mexico State Univ, Las Cruces, NM, USA; Univ Utah, Salt Lake City, UT, USA.
Univ Texas Austin, McDonald Observ, Ft Davis, TX, USA.
Observ Nacl, Sao Cristovao, RJ, Brazil; Univ Arizona, Tucson, AZ, USA.
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2018 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 156, no 3, article id 125Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 156, no 3, article id 125
Keywords [en]
methods: data analysis, stars: abundances, techniques: spectroscopic
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-364166DOI: 10.3847/1538-3881/aad4f9ISI: 000443140500001OAI: oai:DiVA.org:uu-364166DiVA, id: diva2:1260367
Funder
Stiftelsen Olle Engkvist ByggmästareAvailable from: 2018-11-02 Created: 2018-11-02 Last updated: 2018-11-02Bibliographically approved

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Edvardsson, Bengt

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