J-PLUS: Stellar Parameters, C, N, Mg, Ca and [α/Fe] Abundances for Two Million Stars from DR1

Abstract

Context. The Javalambre Photometric Local Universe Survey (J-PLUS) has obtained precise photometry in twelve specially designed filters for large numbers of Galactic stars. Deriving their precise stellar atmospheric parameters and individual elemental abundances is crucial for studies of Galactic structure, and the assembly history and chemical evolution of our Galaxy. Aims. Our goal is to estimate not only stellar parameters (effective temperature, Teff, surface gravity, log g, and metallicity, [Fe/H]), but also [α/Fe] and four elemental abundances ([C/Fe], [N/Fe], [Mg/Fe], and [Ca/Fe]) using data from J-PLUS DR1. Methods. By combining recalibrated photometric data from J-PLUS DR1, Gaia DR2, and spectroscopic labels from LAMOST, we design and train a set of cost-sensitive neural networks, the CSNet, to learn the non-linear mapping from stellar colors to their labels. Results. We have achieved precisions of δTeff {\sim}55K, δlogg{\sim}0.15dex, and δ[Fe/H]{\sim}0.07dex, respectively, over a wide range of temperature, surface gravity, and metallicity. The uncertainties of the abundance estimates for [α/Fe] and the four individual elements are in the range 0.04-0.08 dex. We compare our parameter and abundance estimates with those from other spectroscopic catalogs such as APOGEE and GALAH, and find an overall good agreement. Conclusions. Our results demonstrate the potential of well-designed, high-quality photometric data for determinations of stellar parameters as well as individual elemental abundances. Applying the method to J-PLUS DR1, we have obtained the aforementioned parameters for about two million stars, providing an outstanding data set for chemo-dynamic analyses of the Milky Way. The catalog of the estimated parameters is publicly accessible.

30 pages, 26 figures, 3 tables, accepted by A&A

References in corpus (18)

• The Gaia mission
• COSMOS Photometric Redshifts with 30-bands for 2-deg2
• The GALAH Survey: Scientific Motivation
• The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Medium-Band optical imaging and high quality 32-band photometric redshifts in the ECDF-S
• SkyMapper Southern Survey: Second Data Release (DR2)
• The ALHAMBRA Project: A large area multi medium-band optical and NIR photometric survey
• Milky Way Tomography with the SkyMapper Southern Survey. II. Photometric Re-calibration of SMSS DR2
• The ability of intermediate-band Stromgren photometry to correctly identify dwarf, subgiant, and giant stars and provide stellar metallicities and surface gravities
• Stellar color regression: a spectroscopy based method for color calibration to a few mmag accuracy and the recalibration of Stripe 82
• A Machine Learning Method to Infer Fundamental Stellar Parameters from Photometric Light Curves
• Stellar metallicities from SkyMapper photometry I: A study of the Tucana II ultra-faint dwarf galaxy
• Milky Way tomography with the SkyMapper Southern Survey: I: Atmospheric parameters and distances of one million red giants
• Stellar loci I. Metallicity dependence and intrinsic widths
• Correction to the photometric colors of Gaia Early Data Release 3
• Stellar loci III: Photometric metallicities for half million FGK stars of Stripe 82
• Correction to the photometric magnitudes of the Gaia Early Data Release 3
• Correction to the photometric colors of the Gaia Data Release 2 with the stellar color regression method
• Photometric recalibration of the SDSS Stripe 82 to a few milimagnitude precision with the stellar color regression method and Gaia EDR3

Cited by in corpus (15)

• The Pristine survey -- XXIII. Data Release 1 and an all-sky metallicity catalogue based on Gaia DR3 BP/RP spectro-photometry
• Photometric metallicity for 694233 Galactic giant stars from Gaia DR3 synthetic Stromgren photometry. Metallicity distribution functions of halo sub-structures
• J-PLUS: Support Vector Regression to Measure Stellar Parameters
• The S-PLUS Ultra-Short Survey: first data release
• Metallicity and $\alpha$-abundance for 48 million stars in low-extinction regions in the Milky Way
• Stellar Loci VI: An Updated Catalog of the Best and Brightest Metal-poor Stars
• Stellar atmospheric parameters and chemical abundances of about 5 million stars from S-PLUS multi-band photometry
• Chemodynamical Properties and Ages of Metal-Poor Stars in S-PLUS
• Mapping H$\alpha$-Excess Candidate Point Sources in the Southern Hemisphere Using S-PLUS Data
• A Catalog of 12,766 Carbon-enhanced Metal-poor Stars from LAMOST Data Release 8
• The miniJPAS survey: stellar atmospheric parameters from 56 optical filters
• Recent Advances in Understanding R-Process Nucleosynthesis in Metal-Poor Stars and Stellar Systems
• M Subdwarf Research III. Spectroscopic Diagnostics for Breaking Parameter Degeneracy
• The Stellar Abundances and Galactic Evolution Survey (SAGES). IV. Surface Gravity Estimation and Giant-Dwarf Separation with the DDO51 Filter
• J-PLUS Reconstructing the Milky Way Disc's star formation history with twelve-filter photometry