Value-added catalog of M-giant stars in LAMOST DR9

Abstract

In this work, we update the catalog of M-giant stars from the low-resolution spectra of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 9. There are 58,076 M giants identified from the classification pipeline with seven temperature subtypes from M0 to M6. The 2471 misclassified non-M-giant stars are white dwarf binaries, early types, and M dwarfs. And the contamination rate is 4.2$\%$ in the M-giants sample. A total of 372 carbon stars were identified by CaH spectral indices, and were further confirmed by the LAMOST spectra. We update the correlation between the $(W1-W2{)}_0$ color and [M/H] from APOGEE DR17. We calculate the radial velocities of all M giants by applying cross-correlation to the spectra between 8000 and 8950 Åwith synthetic spectra from ATLAS9. Taking star distances less than 4 kpc from Gaia EDR3 as the standard, we refitted the photometric distance relation of M giants. And based on our M-giant stars, we select a group of Sagittarius stream members, whose sky and 3D velocity distributions are well consistent with K-giant Saggitarius stream members found in Yang et al. With our M giants, we find that the disk is asymmetric out to R = 25 kpc, which is 5 kpc further out than detected using K giants.

23 pages, 10 figures. arXiv admin note: text overlap with arXiv:1908.01128

References in corpus (15)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Revised metallicity classes for low-mass stars: dwarfs (dM), subdwarfs (sdM), extreme subdwarfs (esdM), and ultra subdwarfs (usdM)
• Gaia Early Data Release 3: Summary of the contents and survey properties
• Self-consistent Stellar Radial Velocities from LAMOST Medium-Resolution Survey (MRS) DR7
• Overview of the LAMOST survey in the first decade
• Exploring Halo Substructure with Giant Stars: The Nature of the Triangulum-Andromeda Stellar Features
• Characterisation of Galactic carbon stars and related stars from Gaia-EDR3
• Exploring the pertubed Milky Way disk and the substructures of the outer disk
• Tracing Kinematic and Chemical Properties of Sagittarius Stream by K-Giants, M-Giants, and BHB stars
• Carbon stars from LAMOST DR2 data
• Properties of carbon stars in the Solar neighbourhood based on Gaia DR2 astrometry
• Detecting the Sagittarius stream with LAMOST DR4 M giants \& Gaia DR2
• Relative Flux Calibration of the LAMOST Spectroscopic Survey of the Galactic Anti-center
• Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8
• Exploring the Galactic Anticenter substructure with LAMOST & Gaia DR2

Cited by in corpus (5)

• All-Sky Kinematics of the Distant Halo: The Reflex Response to the LMC
• A Pristine-UNIONS view on the Galaxy: Kinematics of the distant spur feature of the Sagittarius stream traced by Blue Horizontal Branch stars
• Deep learning interpretability analysis for carbon star identification in Gaia DR3
• Unveiling Galactic substructures with M Giant stars: A kinematic and chemical study based on LAMOST DR9, Gaia DR3 and APOGEE DR17
• Calibrating the Color-Magnitude Relation of M Giants by Using Open Clusters