Work

Stellar Parameters for over 50 Million Stars from SMSS DR4 and Gaia DR3

Year: 2025

Type: article

Abstract: We present an updated catalog of stellar parameters, including effective temperature, luminosity classification, and metallicity, for over fifty million stars from the SkyMapper Southern Survey (SMSS) DR4 and Gaia DR3. The accuracy of the derived parameters remains consistent with those achieved with SMSS DR2 using the same methods. Thanks to the advancements in SMSS DR4, photometric-metallicity estimates are now available for an unprecedented number of metal-poor stars. The catalog includes over 13 million metal-poor ([Fe/H] ≤ −1) stars, nearly three million very metal-poor ([Fe/H] ≤ −2.0) stars, and approximately 120,000 extremely metal-poor ([Fe/H] ≤ −3.0) stars—representing an increase by a factor of 4–6 compared to SMSS DR2. This catalog, combined with other stellar parameters obtained through our efforts, will be made available at the China-VO and Zenodo.

Source: Research Notes of the AAS

DOI: 10.3847/2515-5172/adc8a2

Authors: Yang Huang, Timothy C. Beers

Institutions: Chinese Academy of Sciences, National Astronomical Observatories, University of Chinese Academy of Sciences, University of Notre Dame

Language: English

Topic: Stellar, planetary, and galactic studies

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W4409233335

FWCI: 1.36

Cites: 14

Cited by: 3

Related to: 10