Beyond spectroscopy. II. Stellar parameters for over twenty million stars in the northern sky from SAGES DR1 and Gaia DR3

We present precise photometric estimates of stellar parameters, including effective temperature, metallicity, luminosity classification, distance, and stellar age, for nearly 26 million stars using the methodology developed in the first paper of this series, based on the stellar colors from the Stel...

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Bibliographic Details
Published in:arXiv.org 2023-07
Main Authors: Huang, Yang, Beers, Timothy C, Hai-Bo Yuan, Ke-Feng, Tan, Wang, Wei, Zheng, Jie, Li, Chun, Young Sun Lee, Hai-Ning, Li, Jing-Kun Zhao, Xiang-Xiang Xue, Yu-Juan, Liu, Hua-Wei, Zhang, Xue-Ang, Sun, Li, Ji, Hong-Rui, Gu, Wolf, Christian, Onken, Christopher A, Ji-Feng, Liu, Zhou, Fan, Zhao, Gang
Format: Article
Language:English
Subjects:
Design parameters
Estimates
Galactic evolution
Giant stars
Iron
Luminosity
Metallicity
Northern sky
Parallax
Parameter sensitivity
Photometry
Southern sky
Spectral classification
Stellar age
Stellar color
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Summary:We present precise photometric estimates of stellar parameters, including effective temperature, metallicity, luminosity classification, distance, and stellar age, for nearly 26 million stars using the methodology developed in the first paper of this series, based on the stellar colors from the Stellar Abundances and Galactic Evolution Survey (SAGES) DR1 and Gaia EDR3. The optimal design of stellar-parameter sensitive \(uv\) filters by SAGES has enabled us to determine photometric-metallicity estimates down to \(-3.5\), similar to our previous results with the SkyMapper Southern Survey (SMSS), yielding a large sample of over five million metal-poor (MP; [Fe/H]\(\le -1.0\)) stars and nearly one million very metal-poor (VMP; [Fe/H]\(\le -2.0\)) stars. The typical precision is around \(0.1\) dex for both dwarf and giant stars with [Fe/H]\(>-1.0\), and 0.15-0.25/0.3-0.4 dex for dwarf/giant stars with [Fe/H]\(
ISSN:2331-8422