J-PLUS: Beyond Spectroscopy. III. Stellar Parameters and Elemental-abundance Ratios for Five Million Stars from DR3
Fan, Zhou;
Huang, Yang;
Liu, Jifeng;
Beers, Timothy C.;
Lee, Young Sun;
Coelho, Paula;
Yuan, Haibo;
Xiao, Kai;
Dupke, Renato;
Varela, Jesús;
Gu, Hongrui;
Cristóbal-Hornillos, David;
Cenarro, Javier;
Hong, Jihye;
Jiménez-Esteban, Fran;
Daflon, Simone;
López-Sanjuan, Carlos;
Vázquez Ramió, Héctor;
Alcaniz, Jailson;
Ederoclite, Alessandro;
Marín-Franch, Antonio;
Moles, Mariano;
Sodré, Laerte;
Galindo-Guil, F. J.;
Cruz, Patricia;
Hernández-Monteagudo, Carlos;
Angulo, Raul E.
China, United States, South Korea, Brazil, Spain
Abstract
We present a catalog of stellar parameters (effective temperature T eff, surface gravity logg , age, and metallicity [Fe/H]) and elemental-abundance ratios ([C/Fe], [Mg/Fe], and [α/Fe]) for some five million stars (4.5 million dwarfs and 0.5 million giant stars) in the Milky Way, based on stellar colors from the Javalambre Photometric Local Universe Survey (J-PLUS) DR3 and Gaia EDR3. These estimates are obtained through the construction of a large spectroscopic training set with parameters and abundances adjusted to uniform scales, and trained with a kernel principal component analysis. Owing to the seven narrow/medium-band filters employed by J-PLUS, we obtain precisions in the abundance estimates that are as good as or better than those derived from medium-resolution spectroscopy for stars covering a wide range of the parameter space: 0.10–0.20 dex for [Fe/H] and [C/Fe], and 0.05 dex for [Mg/Fe] and [α/Fe]. Moreover, systematic errors due to the influence of molecular carbon bands on previous photometric-metallicity estimates (which only included two narrow/medium-band blue filters) have now been removed, resulting in photometric-metallicity estimates down to [Fe/H] ∼ ‑4.0, with typical uncertainties of 0.40 dex and 0.25 dex for dwarfs and giants, respectively. This large photometric sample should prove useful for the exploration of the assembly and chemical-evolution history of our Galaxy.
2024
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The Astrophysical Journal
Gaia
8
