Metallicities for LAMOST LRS DR10 M dwarf stars

By employing Cycle-StarNet, an innovative domain adaptation approach, we successfully bridge the gap between theoretical PHOENIX synthetic spectra and observed LAMOST spectra, enabling parameter measurements even for lower signal-to-noise (S/N) data (S/N>5).

The fitting residual analysis shows a reduction from 2.0 times to 1.68 times the flux uncertainty. Comparing with available literature values, we find systematic offsets and precisions of 12{\pm}70K in Teff, -0.04{\pm}0.17dex in logg, and -0.06{\pm}0.20dex in [M/H]. The precision improves for higher-quality spectra (S/N>50) to 47K, 0.12dex, and 0.14 dex respectively.