2022A&A...660A..38W


Query : 2022A&A...660A..38W

2022A&A...660A..38W - Astronomy and Astrophysics, volume 660A, 38-38 (2022/4-1)

Ultracool dwarfs identified using spectra in LAMOST DR7.

WANG Y.-F., LUO A.-L., CHEN W.-P., JONES H.R.A., DU B., LI Y.-B., ZHANG S., BAI Z.-R., KONG X. and GUO Y.-X.

Abstract (from CDS):

In this work, we identify 734 ultracool dwarfs with a spectral type of M6 or later, including one L0. Of this sample, 625 were studied spectroscopically for the first time. All of these ultracool dwarfs are within 360 pc, with a GaiaG magnitude brighter than ∼19.2 mag. By studying the spectra and checking their stellar parameters (Teff, log g, and [M/H]) derived with the LAMOST pipeline, we found their cool red nature and their metallicity to be consistent with the nature of Galactic thin-disk objects. Furthermore, 77 of them show lithium absorption lines at 6708 Å, further indicating their young ages and substellar nature. Kinematics obtained through LAMOST radial velocities, along with the proper motion and parallax data from Gaia EDR3, also suggest that the majority of our targets are thin-disk objects. Kinematic ages were estimated through the relationship between the velocity dispersion and the average age for a certain population. Moreover, we identified 35 binaries, with 6 of them reported as binaries for the first time.

Abstract Copyright: © ESO 2022

Journal keyword(s): surveys - stars: low-mass - brown dwarfs - binaries: visual - stars: late-type

VizieR on-line data: <Available at CDS (J/A+A/660/A38): table1.dat table2.dat table3.dat>

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3411 0
2 LP 213-67 PM* 10 47 12.6095390983 +40 26 43.737443862   19.2       M6.5Ve 40 1
3 LP 213-68 ** 10 47 13.7778721616 +40 26 49.263789176   21.2   19.1   M8+L0 37 0
4 2MASS J12043036+3212595 BD* 12 04 30.3584978184 +32 12 59.523701148           L0e 22 0
5 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14216 0

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