Homogeneous Stellar Atmospheric Parameters and 22 Elemental Abundances for FGK Stars Derived From LAMOST Low-resolution Spectra with DD-PAYNE

An updated catalog of stellar labels derived from LAMOST low-resolution spectra in a physics-sensible and rigorous manner with DD-PAYNE, taking labels from high-resolution spectroscopy as training set. The catalog contains atmospheric parameters for 6.6 million stars released in LAMOST DR9, and abundances for 22 elements, namely, C, N, O, Na, Mg, Al, Si, Ca, Ti, Cr, Mn, Fe, Ni, Sr, Y, Zr, Ba, La, Ce, Nd, Sm, and Eu, for nearly 3.6 million stars with spectral signal-to-noise ratio (SNR) higher than 20. Homogenization to the label estimates is carried out via dedicated internal and external calibration. The elemental abundances are internally calibrated using wide binaries, eliminating systematic trend with effective temperature. Both the recommended catalog and the elemental abundances without calibrations are in .FITS format. Size of the recommended catalog is 3.2 GB, and that of the abundances catalog without calibration is about 973 MB.