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Masses and Ages for 230,000 LAMOST Giants, via Their Carbon and Nitrogen Abundances

Ness, Melissa; Ting, Yuan-Sen; Rix, Hans-Walter; Ho, Anna Y.Q.; Hogg, David W.; Liu, Chao

Description

We measure carbon and nitrogen abundances to a precision of ≲0.1 dex for 450,000 giant stars from their lowresolution (R ∼ 1800) LAMOST DR2 survey spectra. We use these [C M] and [N M] measurements, together with empirical relations based on the APOKASC sample, to infer stellar masses and implied ages for 230,000 of these objects to 0.08 dex and 0.2 dex respectively. We use The Cannon, a data-driven approach to spectral modeling, to construct a predictive model for LAMOST spectra. Our reference...[Show more]

CollectionsANU Research Publications
Date published: 2017
Type: Journal article
URI: http://hdl.handle.net/1885/218208
Source: The Astrophysical Journal
DOI: 10.3847/1538-4357/aa6db3

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