J/other/RAA/24.K5021 13 Galactic Star Clusters in Gaia DR3 (Chi+, 2024)
13 Galactic Star Clusters in Gaia DR3 Identified by An Improved FoF and
UPMASK Hybrid Method Using MvC.
Chi H., Lai Z., Wang F., Li Z., Mei Y.
<Res. Astron. Astrophys., 24, 115021 (2024)>
=2024RAA....24k5021C 2024RAA....24k5021C (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Optical
Keywords: galaxies: star clusters: general -
(Galaxy:) open clusters and associations: general -
methods: data analysis
Abstract:
Open clusters (OCs) serve as invaluable tracers for investigating the
properties and evolution of stars and galaxies.
Despite recent advancements in machine learning clustering algorithms,
accurately discerning such clusters remains challenging. We re-visited
the 3013 samples generated with a hybrid clustering algorithm of FoF
and pyUPMASK. A multi-view clustering (MvC) ensemble method was
applied, which analyzes each member star of the OC from three
perspectives -- proper motion, spatial position, and composite
views -- before integrating the clustering outcomes to deduce more
reliable cluster memberships. Based on the MvC results, we further
excluded cluster candidates with fewer than ten member stars and
obtained 1256 OC candidates. After isochrone fitting and visual
inspection, we identified 506 candidate OCs in the Milky Way. In
addition to the 493 previously reported candidates, we finally
discovered 13 high-confidence new candidate clusters.
Description:
We proposed an effective clustering method for identifying
reliable cluster member stars. The identification results show that
the MvC algorithm is capable of effectively identifying reliable
member stars. This is the first attempt at using MvC to develop an
ensemble clustering technique for hunting star clusters. As a result
of re-identification, 13 reliable OCs are reported in this work
through isochrone-fitting and visual inspection.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 13 Parameters of Final 13 OCs
table2.dat 141 1228 Clustered Sources
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Cluster Cluster id in this work
9- 11 I3 --- Nstar [20/378] Number of star member
13- 19 F7.3 deg RAdeg Mean right ascension of members (ICRS)
at Ep=2026.0
21- 25 F5.3 deg e_RAdeg Standard deviation of right ascension
27- 33 F7.3 deg DEdeg Mean declination of members of members (ICRS)
at Ep=2026.0
35- 39 F5.3 deg e_DEdeg Standard deviation of declination of members
41- 45 F5.3 mas plx Mean parallax of members
47- 51 F5.3 mas e_plx Standard deviation of parallax
53- 58 F6.3 mas/yr pmRA Mean proper motion in right ascension of
members
60- 64 F5.3 mas/yr e_pmRA Standard deviation of proper motion in
right ascension
66- 71 F6.3 mas/yr pmDE Mean proper motion in declination of members
73- 77 F5.3 mas/yr e_pmDE Standard deviation of proper motion in
declination
79- 85 F7.3 deg GLON Mean Galactic longitude of members
87- 92 F6.3 deg GLAT Mean Galactic latitude of members of members
94- 97 F4.2 [Sun] logZ Cluster metallicity determined by the
isochrone fit
99-103 F5.2 [yr] logAge Cluster age determined by the isochrone fit
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Star [0/1227] Star sequential number
6- 24 I19 --- GaiaDR3 Gaia DR3 Unique source identifier, source_id
26- 33 F8.4 deg RAdeg Right ascension (ICRS atEpoch = 2016)
35- 42 F8.4 deg DEdeg Declination (ICRS at Epoch = 2016)
44- 49 F6.3 mas/yr pmRA Proper motion in RA.
51- 56 F6.3 mas/yr pmDE Proper motion in DE
58- 62 F5.3 mas plx Parallax
64- 69 F6.3 mag Gmag G magnitude
71- 76 F6.3 mag BPmag RP magnitude
78- 83 F6.3 mag RPmag BP magnitude
85- 92 F8.3 km/s RV ? Radial velocity
94- 98 F5.3 deg e_RAdeg Standard error of RA
100-104 F5.3 deg e_DEdeg Standard error of DE
106-110 F5.3 mas/yr e_pmRA Standard error of proper motion in RA.
112-116 F5.3 mas/yr e_pmDE Standard error of proper motion in DE
118-122 F5.3 mas e_plx Standard error of parallax
124-128 F5.3 km/s e_RV ? Standard error of RV
130-133 F4.2 --- Pmemb Membership probability obtained from pyUPMASK
135-141 A7 --- Cluster Corresponding cluster ID in this work
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History:
From electronic version of the journal,
https://www.scidb.cn/en/detail?dataSetId=7eb49ebd189f4474bd58815f99e51705
(End) Patricia Vannier [CDS] 12-Aug-2025