J/A+A/668/A4 LAMOST open clusters (Fu+, 2022)
LAMOST meets Gaia: The Galactic open clusters.
Fu X., Bragaglia A., Liu C., Zhang H., Xu Y., Wang K., Zhang Z.-Y.,
Zhong J. Z., Chang J., Li L., Chen L., Chen Y., Wang F., Gjergo E.,
Wang C., Yue N., Zhang X.
<Astron. Astrophys. 668, A4 (2022)>
=2022A&A...668A...4F 2022A&A...668A...4F (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Abundances ; Spectroscopy ; Optical
Keywords: open clusters and associations: general - Galaxy: stellar content -
Galaxy: evolution - Galaxy: disk
Abstract:
Open clusters (OCs) are born and evolve along the Milky Way (MW)
plane. On them is imprinted the history of the Galactic disc,
including its chemical and dynamical evolution. Chemical and dynamical
properties of OCs can be derived from photometric, spectroscopic, and
astrometric data of their member stars. Based on the photometric and
astrometric data from the Gaia mission, the membership of stars in
more than two thousand Galactic clusters has been identified in the
literature. The chemical properties (e.g. metallicity) and kinematical
properties (e.g. radial velocity), however, are still poorly known for
many of these clusters. In synergy with the large spectroscopic survey
LAMOST (data release 8) and Gaia (data release 2), we report a new
comprehensive catalogue of 386 OCs. This catalogue has homogeneous
parameter determinations of radial velocity, metallicity, and
dynamical properties, such as orbit, eccentricity, angular momenta,
total energy, and 3D Galactic velocity. These parameters enable the
first radial velocity determination for 44 clusters, and the first
spectroscopic [Fe/H] determination for 137 clusters. The metallicity
distributions of the majority of clusters show falling trends in the
parameter space of the Galactocentric radius, the total energy, and
the Z component of angular momentum, except for two old groups that
show flat tails in their own parameter planes. Cluster populations of
ages younger and older than 500 Myrs distribute diversely on the disc.
The latter have a spatial consistency with the Galactic disc flare.
The 3D spatial comparison between very young clusters (<100 Myr) and
nearby molecular clouds revealed a wide range of metallicity
distribution along the Radcliffe gas cloud wave, indicating a possible
inhomogeneous mixing or fast star formation along the wave. This
catalogue will serve the community as a useful tool to trace the
chemical and dynamical evolution of the MW.
Description:
In synergy with the large spectroscopic survey LAMOST (DR8) and Gaia
(DR2), we report a new comprehensive catalogue of 386 OCs. The cluster
membership is based on Cantat-Gaudin et al. (2020A&A...640A...1C 2020A&A...640A...1C, Cat.
J/A+A/640/A1). The radial velocity, iron abundance, and the dynamical
parameters of these clusters, together with the spectroscopic stellar
parameters of 7570 member stars from LAMOST are provided here. The
full version of Table 1 and Table 3 in the paper are also provided.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 141 342 OCs with known Vrad in the literature
table3.dat 212 218 OCs with FeH values in the literature
clusterp.dat 481 386 Cluster parameters
memberl.dat 185 7570 Member star parameters
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
http://www.lamost.org/dr8/ : LAMOST DR8 home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Cluster Cluster name (cluster)
19- 22 I4 --- Nall Number of matched LAMOST stars (N_all)
24- 27 I4 --- Nflag1 Number of stars with flag=1 (N_flag1)
29- 36 F8.3 km/s RVmed Median value of the cluster RV (Vrad_med)
38- 43 F6.3 km/s e_RVmed Median value uncertainty of the cluster RV
(Vradmederr)
45- 52 F8.3 km/s RVmean Mean value of the cluster RV (Vrad_mean)
54- 59 F6.3 km/s e_RVmean Mean value uncertainty of the cluster
(Vradmeanerr)
61- 65 F5.2 km/s s_RV ?=- Standard deviation of the cluster RV
(Vrad_std)
67- 73 F7.2 km/s RVT ?=- Cluster RV from Tarricq et al.
(2021, Cat. J/A+A/647/A19) (RV_Tarricq21)
75- 79 F5.2 km/s e_RVT ?=- Cluster RV error from Tarricq et al.
(2021, Cat. J/A+A/647/A19) (eRVTarricq21)
81- 86 I6 --- NRVT ?=- Number of RV stars from Tarricq et al.
(2021, Cat. J/A+A/647/A19) (NRV_Tarricq21)
88- 94 F7.3 km/s RVD ?=- Cluster RV from Dias et al.
(2021, Cat. J/MNRAS/504/356) (RV_Dias21)
96-101 F6.3 km/s e_RVD ?=- Cluster RV error from Dias et al.
(2021, Cat. J/MNRAS/504/356) (eRVDias21)
103-108 I6 --- NRVD ?=- Number of RV stars from Dias et al.
(2021, Cat. J/MNRAS/504/356) (NRV_Dias21)
110-122 F13.8 km/s RVZ ?=- Cluster RV from Zhong et al.
(2020, Cat. J/A+A/640/A127) (RV_Zhong20)
124-134 F11.7 km/s e_RVZ ?=- Cluster RV error Zhong et al.
(2020, Cat. J/A+A/640/A127) (eRVZhong20)
136-141 I6 --- NRVZ ?=- Number of RV stars from Zhong et al.
(2020, Cat. J/A+A/640/A127) (NRV_Zhong20)
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Cluster Cluster name (CLUSTER)
18- 20 I3 --- Nflag12 Number of stars with flag=12 (N_flag12)
22- 45 E24.16 [-] [Fe/H]med Median value of the cluster [Fe/H] (FeH_med)
47- 67 F21.19 [-] e_[Fe/H]med Median value uncertainty of the cluster
[Fe/H] (FeHmederr)
69- 90 F22.19 [-] [Fe/H]mean Mean value of the cluster [Fe/H] (FeH_mean)
92-112 F21.19 [-] e_[Fe/H]mean Mean value uncertainty of the cluster [Fe/H]
(FeHmeanerr)
114-133 F20.18 [-] s_[Fe/H] ?=- Standard deviation of the cluster [Fe/H]
(FeH_std)
135-140 F6.3 [-] [Fe/H]HRS ?=- Cluster [Fe/H] with HRS (FeH_HRS)
142-146 F5.3 [-] e_[Fe/H]HRS ?=- Cluster [Fe/H] uncertainty with HRS
(FeHHRSerr)
148-153 I6 --- N[Fe/H]HRS ?=- Number of HRS stars (N_HRS)
155-167 A13 --- Source HRS source (source)
169-181 F13.10 [-] [Fe/H]Z ?=- Cluster [Fe/H] from Zhong et al.
(2020, Cat. J/A+A/640/A127) (FeH_Zhong20)
183-205 E23.15 [-] e_[Fe/H]Z ?=- Cluster [Fe/H] uncertainty from Zhong et
al. (2020, Cat. J/A+A/640/A127)
(FeHerrZhong20)
207-212 I6 [-] N[Fe/H]Z ?=- Number of [Fe/H] stars from Zhong et al.
(2020, Cat. J/A+A/640/A127) (N_Zhong20)
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Byte-by-byte Description of file: clusterp.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Cluster Cluster name (cluster)
19- 22 I4 --- Nall Number of matched LAMOST stars (N_all)
24- 27 I4 --- Nflag1 Number of stars with flag=1 (N_flag1)
29- 50 F22.17 km/s RVmed Median value of the cluster radial velocity
(Vrad_med)
52- 71 F20.17 km/s e_RVmed Median value uncertainty of the cluster
radial velocity (Vradmederr)
73- 94 F22.17 km/s RVmean Mean value of the cluster radial velocity
(Vrad_mean)
96-115 F20.17 km/s e_RVmean Mean value uncertainty of the cluster
radial velocity (Vradmeanerr)
117-135 F19.16 km/s s_RV ?=- Standard deviation of the cluster
radial velocity (Vrad_std)
137-139 I3 --- Nflag12 Number of stars with flag=12 (N_flag12)
141-164 E24.16 [-] [Fe/H]med ?=- Median value of the cluster [Fe/H]
(FeH_med)
166-186 F21.19 [-] e_[Fe/H]med ?=- Median value uncertainty of the cluster
[Fe/H] (FeHmederr)
188-210 E23.15 [-] [Fe/H]mean ?=- Mean value of the cluster [Fe/H]
(FeH_mean)
212-232 F21.19 [-] e_[Fe/H]mean ?=- Mean value uncertainty of the cluster
[Fe/H] (FeHmeanerr)
234-253 F20.18 [-] s_[Fe/H] ?=- Standard deviation of the cluster
[Fe/H] (FeH_std)
255-276 F22.17 kpc.km/s LX ?=- X component of the Galactic angular
momentum (LX)
278-299 F22.17 kpc.km/s LY ?=- Y component of the Galactic angular
momentum (LY)
301-318 F18.13 kpc.km/s LZ ?=- Z component of the Galactic angular
momentum (LZ)
320-340 F21.17 km/s ULSR ?=- U velocity in the local standard of
rest (ULSR)
342-359 F18.14 km/s VLSR ?=- V velocity in the local standard of
rest (VLSR)
361-381 F21.17 km/s WLSR ?=- W velocity in the local standard of
rest (WLSR)
383-405 E23.15 kpc ZGC ?=- Galactic Cartesian coordinate Z (ZGC)
407-425 F19.16 kpc RGC ?=- Galactocentric distance (RGC)
427-439 E13.5 pc Peri ?=- Pericenter distance from the Galactic
center (Pericenter)
441-451 F11.8 pc Apo ?=- Apocenter distance from the Galactic
center (Apocenter)
453-459 I7 km2/s2 Energy ?=- Total dynamical energy of the cluster
(Energy)
461-481 F21.19 --- ecc ?=- Eccentricity of the cluster orbit (ecc)
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Byte-by-byte Description of file: memberl.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR2 Gaia DR2 source_id (GaiaDR2)
21- 29 F9.6 mag Gmag G magnitude in Gaia DR2 (photgmean_mag)
31- 39 F9.6 mag BPmag ?=- BP magnitude in Gaia DR2
(photbpmean_mag)
41- 49 F9.6 mag RPmag ?=- RP magnitude in Gaia DR2
(photrpmean_mag)
51- 54 F4.2 --- Pmemb Membership probability from Cantat-Gaudin
et al. (2020, Cat. J/A+A/640/A1) (proba)
56- 72 A17 --- Cluster Cluster name (Cluster)
74- 77 F4.1 --- Flag ?=- Quality control flag (flag)
79- 87 I9 --- Obsid LAMOST DR8 obsid (obsid)
89- 98 A10 "date" Obs.date LAMOST observation date (obsdate)
100-110 F11.7 deg RAdeg Object right ascension in LAMOST DR8 (J2000)
(ra_obs)
112-121 F10.7 deg DEdeg Object declination in LAMOST DR8 (J2000)
(dec_obs)
123-129 F7.2 K Teff Effective temperature (teff)
131-138 F8.2 K e_Teff ?=-9999 effective temperature uncertainty
(teff_err)
140-144 F5.3 [cm/s2] logg Surface gravity (logg)
146-154 F9.3 [cm/s2] e_logg ?=-9999 Surface gravity uncertainty
(logg_err)
156-161 F6.3 [-] [Fe/H] Iron abundance (feh)
163-171 F9.3 [-] e_[Fe/H] ?=-9999 Iron abundance uncertainty (feh_err)
173-179 F7.2 km/s RV Radial velocity (rv)
181-185 F5.2 km/s e_RV Radial velocity uncertainty (rv_err)
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Acknowledgements:
Xiaoting Fu, xiaoting.fu(at)pku.edu.cn
(End) Patricia Vannier [CDS] 15-Nov-2022