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Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopicsurveys, wedefined two kinds of star sample: high-velocity thick disk (HVTD)with $v{\phi}>90km/s$ and metal-richstellar halo (MRSH) with $v{\phi}<90km/s$.Due to high resolution spectra data from APOGEE (DR16),we can analyzeaccurately the element abundance distribution of HVTD and MRSH. Theseelementsabundance constituted a multidimensional data space, and we introducedan algorithm method forprocessing multi-dimensional data to give the result ofdimensionality reduction clustering. Accordingto chemical properties analysis,we derived that some HVTD stars could origin from the thin disk,and some MRSHstars from dwarf galaxies, but those stars which have similar chemicalabundancecharacteristics in both sample may form in-situ.

Element abundance analysis of the metal-rich stellar halo and high-velocitythick disk in the galaxy