Lamost Medium-Resolution Spectral Survey Of Galactic Nebulae (Lamost Mrs-N): An Overview Of Scientific Goals And Survey Plan

Since Sep. 2018, LAMOST has started the medium-resolution (R similar to 7500) spectral survey (MRS). We proposed the spectral survey of Galactic nebulae, including H ii regions, HH objects, supernova remnants, planetary nebulae and the special stars with MRS (LAMOST MRS-N). LAMOST MRS-N covers about 1700 square degrees of the northern Galactic plane within 40 degrees < l < 215 degrees and -5 degrees < b < 5 degrees. In this 5-year survey, we plan to observe about 500 thousand nebulae spectra. According to the commissioning observations, the nebulae spectra can provide precise radial velocity with uncertainty less than 1 km s(-1). These high-precision spectral data are of great significance to our understanding of star formation and evolution.