2025/12/11 by Li, Shuo, Li, Yin-Bi, Luo, A-Li +10
Physics and Astronomy · Engineering · #Stellar, planetary, and galactic studies #Astronomy and Astrophysical Research #Space Technology and Applications
paper · doi:10.48550/arxiv.2512.10337
Precise stellar parameters for M-type stars, the Galaxy's most common stellar type, are crucial for numerous studies. In this work, we refined the LAMOST DR10 M-type star catalog through a two-stage process. First, we purified the catalog using techniques including deep learning and color-magnitude diagrams to remove 22,496 non-M spectra, correct 2,078 dwarf/giant classifications, and update 12,900 radial velocities. This resulted in a cleaner catalog containing 870,518 M-type spectra (820,493 dwarfs, 50,025 giants). Second, applying a label transfer strategy using values from APOGEE DR16 for parameter prediction with a ten-fold cross-validated CNN ensemble architecture, we predicted Teff, log g, [M/H], and [α/M] separately for M dwarfs and giants. The average internal errors for M dwarfs/giants are respectively: Teff 30/17 K, log g 0.07/0.07 dex, [M/H] 0.07/0.05 dex, and [α/M] 0.02/0.02 dex. Comparison with APOGEE demonstrates external precisions of 34/14 K, 0.12/0.07 dex, 0.09/0.04 dex, and 0.03/0.02 dex for M dwarfs/giants, which represents precision improvements of over 20% for M dwarfs and over 50% for M giants compared to previous literature results. The catalog is available at https://nadc.china-vo.org/res/r101668/.