A dataset of M giant stars from LAMOST DR5

table 1:This dataset contains a carefully selected sample of 3,343 M giant stars used to investigate Galactic substructures. The parent sample originates from Li et al. (2023), who identified 58,076 M giants based on low-resolution spectra from LAMOST DR9, with radial velocities. Distances for the stars are from Qiu et al. (2023). Proper motions are adopted from Gaia DR3. Chemical abundances ([M/H] and [α/M]) for a subset of the sample were obtained through cross-matching with APOGEE DR17.The final dataset includes stars satisfying the following criteria:∣Zgc​∣>2 kpc,Total velocity Vtot​<400km s−1,Velocity component uncertainties σU​,σV​,σW​<100km s−1.Each row in the dataset corresponds to one M giant star and includes the following parameters:LAMOST_obsid: obsid fromLAMOSTDR9Gaia_source_id: source_id from Gaia DR3APOGEE_ID: ID from APOGEE DR17Right Ascension (R.A.) and Declination (Dec.),Heliocentric distance (in kpc),Radial velocity (in km s−1),Proper motions in mas yr−1,Chemical abundances: [M/H]and [α/M].The data file is in CSV format, containing 3343 rows and multiple columns corresponding to the parameters listed above. The total file size is 464 KB.table 3:Orbital parameters of all Galactic substructures we identified. The first column indicates the stellar substructure affiliation, and the second column represents the LAMOST observation ID.The data file is in CSV format, containing 1597 rows and multiple columns corresponding to the parameters listed above. The total file size is 142 KB.