Value-added Catalog of M-giant Stars in LAMOST DR9

被引:7
|
作者
Li, Jing [1 ]
Long, Lin [1 ]
Zhong, Jing [2 ]
Tang, Lin [1 ]
Zhang, Bo [3 ]
Qin, Songmei [2 ,4 ]
Chen, Yirong [1 ]
Yan, Zhengzhou [1 ]
Chen, Li [2 ,4 ]
Xue, Xiang-Xiang [5 ,6 ]
Hou, Jinliang [2 ,4 ]
Shi, Jian-Rong [4 ,5 ]
机构
[1] China West Normal Univ, Sch Phys & Astron, 1 ShiDa Rd, Nanchong 637002, Peoples R China
[2] Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
[3] Chinese Acad Sci, Key Lab Space Astron & Technol, Natl Astron Observ, Beijing 100101, Peoples R China
[4] Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
[5] Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
[6] Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
来源
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2023年 / 266卷 / 01期
基金
中国国家自然科学基金; 美国国家航空航天局;
关键词
CARBON STARS; SPECTROSCOPIC SURVEY; SAGITTARIUS STREAM; M-DWARFS; GAIA; TELESCOPE; GALAXY; SUBSTRUCTURE; KINEMATICS; SPECTRA;
D O I
10.3847/1538-4365/acc395
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 angstrom with 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.
引用
收藏
页数:10
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