Estimating ages and metallicities of M31 star clusters from LAMOST DR6

Context. Determining the metallicities and ages of M31 clusters is fundamental to study formation evolution itself. The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) has carried out a systematic spectroscopic campaign candidates in M31. Aims. We constructed catalogue 346 observed by LAMOST. By combining information LAMOST spectra multi-band photometry, we developed new algorithm estimate these clusters. Methods. distinguish young from old using random forest classifiers based on empirical training data set selected literature. Ages are derived spectral energy distribution (SED) fits their photometric measurements. Their estimated fitting principal components extracted with those metal-rich single stellar population (SSP) models. For clusters, built non-parameter models between and/or colours parameters SSP then measurements resultant Results. 53 293 our catalogue. Our good agreement about 30 catalogued 40 sources for first time.