2025/03/12 by Yang Huang, Timothy C. Beers, Huang, Yang +1
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2503.09305
openalex publication_date 2025/03/12 · openalex created_date 2025/10/13 · openalex updated_date 2026/07/28
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 (MP; [Fe/H] ≤ -1) stars, nearly three million very metal-poor (VMP; [Fe/H] ≤ -2.0) stars, and approximately 120,000 extremely metal-poor (EMP; [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 https://nadc.china-vo.org/data/sports/ and https://zenodo.org/records/15108911.