Tracing the Origin of Moving Groups. III. Detecting Moving Groups in LAMOST DR7

Author:

Yang YongORCID,Zhao JingkunORCID,Zhang JiajunORCID,Ye Xianhao,Zhao Gang

Abstract

Abstract We revisit the moving groups (MGs) in the solar neighborhood with a sample of 91,969 nearby stars constructed from LAMOST DR7. Using the wavelet technique and Monte Carlo simulations, five MGs together with a new candidate located at V≃−130 km s−1 are detected simultaneously in V U 2 + 2 V 2 space. Taking into account the other known MGs, we conclude that MGs in the Galactic disk are spaced by approximately 15–25 km s−1 along V velocity. The origin of detected MGs is analyzed through the distributions of [Fe/H]−[Mg/Fe] and ages. Our results support attributing the origin to the continuous resonant mechanisms probably induced by the bar or spiral arms of the Milky Way.

Funder

National Natural Science Foundation of China

MOST ∣ National Key Research and Development Program of China

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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