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Huang, Yang ; Beers, Timothy C. ; Xiao, Kai ; Yuan, Haibo ; Lee, Young Sun ; Gu, Hongrui ; Hong, Jihye ; Liu, Jifeng ; Fan, Zhou ; Coelho, Paula ; Cruz, Patricia ; Galindo-Guil, F. J. ; Daflon, Simone ; Jimenez-Esteban, Fran ; Cenarro, Javier ; Cristobal-Hornillos, David ; Hernandez-Monteagudo, Carlos ; Lopez-Sanjuan, Carlos ; Marin-Franch, Antonio ; Moles, Mariano ; Varela, Jesus ; Ramio, Hector Vazquez ; Alcaniz, Jailson ; Dupke, Renato ; Ederoclite, Alessandro ; Sodre Jr, Laerte ; Angulo, Raul E.

• Tipo de documento: Artigo Científico
• Fonte: ASTROPHYSICAL JOURNAL; v. 974, n. 2, p. 26-pg., 2024-10-01.

Resumo

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 [alpha/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 [alpha/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] similar to -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. (AU)

• Processo FAPESP: 11/51680-6 - Explorando o universo: da formação de galáxias aos planetas tipo-Terra, com o Telescópio Gigante Magellan
• Beneficiário: Laerte Sodré Junior
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais
• Processo FAPESP: 21/08813-7 - Explorando padrões de abundâncias químicas em populações estelares com J-spectra
• Beneficiário: Paula Rodrigues Teixeira Coelho
• Modalidade de apoio: Bolsas no Exterior - Pesquisa