2019/08/03 by Jing Zhong, Jing Li, Jeffrey L. Carlin +3
Physics and Astronomy · #Astronomy and Astrophysical Research #Carbon star #Giant star #Hertzsprung–Russell diagram #LAMOST #Metallicity #Scientific Research and Discoveries #Stars #Stellar classification #Stellar, planetary, and galactic studies #White dwarf #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.3847/1538-4365/ab3859
13 pages, 10 figures, accepted for publication in ApJS
arxiv created 2019/08/03 · openalex created_date 2019/08/13 · openalex publication_date 2019/09/06 · arxiv updated 2019/09/25 · openalex updated_date 2026/08/06
We present new catalogs of M giant and M dwarf stars from the Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) data release 5 (DR5). In total, 39,796 M giants and 501,152 M dwarfs are identified from the classification pipeline. The template-fitting results contain M giants with 7 temperature subtypes from M0 to M6, M dwarfs with 18 temperature subtypes from K7.0 to M8.5, and 12 metallicity subclasses from dMr to usdMp. We cross-matched our M-type catalog with the Two Micron All-Sky Survey (2MASS) and Wide-field Infrared Survey Explorer ( WISE) catalog to obtain infrared magnitude and colors. Adopting the distances derived from the parallaxes in Gaia DR2, the M G versus ( G bp − G rp ) 0 diagram shows that there are also early-type stars and white dwarf–M dwarf binaries included in our M-type stars sample, with a contamination rate of about 4.6% for M giants and 0.48% for M dwarfs. We found that CaH spectral indices are an efficient selection criteria for carbon stars. A total of 289 carbon stars were identified from the M giants sample, and further confirmed by LAMOST spectra.