2023RAA....23b5020W

Query : 2023RAA....23b5020W

2023RAA....23b5020W - Research in Astron. and astroph., 23, part no 2, 5020 (2023/February-0)

Determination of Distance, Extinction, Mass, and Age for Stars in LAMOST DR7.

WANG J., CAO Z., HUANG Y. and YUAN H.

Abstract (from CDS):

Large scale spectroscopic surveys such as that using Large-sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) have collected spectra of millions stars in the Milky Way. Utilizing this huge sample of stars to study the assembling history and structure of our Galaxy requires accurate estimates of distance, extinction, age, and mass for individual stars. Combining the parallax constraint from Gaia EDR3 with Bayesian inference, we have estimated the distance and extinction for stars observed in LAMOST DR7, as well as the stellar mass and age for evolved stars in this data release. We validated the accuracies of the stellar parameters by comparing our results against various measurements, including the star-pair technique, asteroseismology, globular clusters, and isochrone fits to main sequence stars and subgiants. This is a valuable catalog of stellar parameters under a Bayesian framework estimated using the data from Gaia EDR3 and LAMOST spectroscopic data. With this data set we explored the stellar population of the Galactic massive substructure Gaia-Sausage-Enceladus (GSE). The kinematically selected members of GSE have a median metallicity of [Fe/H] = -1.29 and a median age of 11.6 Gyr.

Abstract Copyright: © 2023. National Astronomical Observatories

Journal keyword(s): stars: distances - stars: fundamental parameters - stars: kinematics and dynamics - Galaxy: formation - (Galaxy:) globular clusters: general

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1245 OpC 03 14 44.3 +47 14 06   9.16 8.4     ~ 171 0
2 Cl Berkeley 9 OpC 03 32 39.8 +52 38 57           ~ 47 0
3 NGC 1664 OpC 04 50 59.3 +43 39 48           ~ 143 0
4 NGC 1857 OpC 05 20 07.3 +39 20 13   8.08 7.0     ~ 62 0
5 Cl Berkeley 17 OpC 05 20 30.5 +30 34 20           ~ 192 0
6 NGC 1907 OpC 05 28 07.2 +35 19 33   8.87 8.2     ~ 140 2
7 Cl Berkeley 71 OpC 05 40 56.7 +32 16 11           ~ 49 0
8 NGC 2304 OpC 06 55 12.5 +17 59 03     10.0     ~ 49 0
9 NGC 2420 OpC 07 38 24.6 +21 34 26   9.0 8.3     ~ 523 0
10 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
11 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
12 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
13 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
14 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
15 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
16 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
17 NGC 6811 OpC 19 37 21.8 +46 22 43   7.47 6.8     ~ 435 0
18 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
19 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
20 NGC 7789 OpC 23 57 19.4 +56 43 28   7.68 6.7     ~ 575 0
21 NAME Gaia Enceladus-Sausage St* ~ ~           ~ 860 0

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