LAMOST medium-resolution spectroscopic survey of Galactic Open Clusters (LAMOST-MRS-O): An overview of survey plan and preliminary results

TL;DR

The LAMOST-MRS-O survey provides medium-resolution spectra of stars in open clusters, aiming to study their chemical and dynamical properties, with initial results showing high sampling efficiency and extensive data collection.

Contribution

This paper introduces the LAMOST-MRS-O survey plan, its execution, and preliminary results, highlighting its capability to efficiently sample open cluster member stars.

Findings

Achieved spectral observations for over 130,000 stars in 10 open clusters.

Sampling ratio of member stars with Gmag < 15 reaches 70%.

Survey data supports studies on open cluster evolution.

Abstract

As part of the LAMOST medium-resolution spectroscopic survey, the LAMOST-MRS-O is a non-time domain survey that aims to perform medium-resolution spectral observations for member stars in the open cluster area. This survey plans to obtain the spectroscopic parameters such as radial velocity and metal abundances of member stars and provide data support for further study on the chemical and dynamical characteristics and evolution of open clusters in combination with Gaia data. We have completed the observations on ten open cluster fields and obtained 235184 medium-resolution spectra of 133792 stars. Based on the data analyzed of LAMOST DR11V1.1, for some clusters of particular concern, it is found that the sampling ratio of members stars with Gmag < 15 mag can reach 70%, which indicates that the LAMOST-MRS-O has reached our initial design goal.