| Full text | |
| Author(s): Show less - |
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.
Total Authors: 27
|
| Document type: | Journal article |
| Source: | ASTROPHYSICAL JOURNAL; v. 974, n. 2, p. 26-pg., 2024-10-01. |
| 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 [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) | |
| FAPESP's process: | 11/51680-6 - Exploring the universe: from the galaxies formation to Earth-like planets with the Giant Magellan Telescope |
| Grantee: | Laerte Sodré Junior |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 21/08813-7 - Exploring chemical patterns in stellar populations with J-spectra |
| Grantee: | Paula Rodrigues Teixeira Coelho |
| Support Opportunities: | Scholarships abroad - Research |