J/MNRAS/503/1864 Membership probabilities of 6 open cluster (Pena Ramirez+ 2021)
The VVV open cluster project. Near-infrared sequences of NGC 6067, NGC 6259,
NGC 4815, Pismis 18, Trumpler 23, and Trumpler 20.
Pena Ramirez K., Gonzalez-fernandez C., Chene A.-N., Ramirez Alegria S.
<Mon. Not. R. Astron. Soc., 503, 1864-1876 (2021)>
=2021MNRAS.503.1864P 2021MNRAS.503.1864P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Milky Way ; Proper motions ;
Photometry, infrared ; Optical
Keywords: astronomical databases: miscellaneous - methods:data analysis =
stars: evolution -
open clusters and associations: individual: NGC 6067, NGC 6259,
NGC 4815, Pismis 18, Trumpler 23, Trumpler 20
Abstract:
Open clusters are central elements of our understanding of the
Galactic disc evolution, as an accurate determination of their
parameters leads to an unbiased picture of our Galaxy's structure.
Extending the analysis towards fainter magnitudes in cluster sequences
has a significant impact on the derived fundamental parameters, such
as extinction and total mass. We perform a homogeneous analysis of six
open stellar clusters in the Galactic disc using kinematic and
photometric information from the Gaia DR2 and VVV surveys: NGC 6067,
NGC 6259, NGC 4815, Pismis 18, Trumpler 23, and Trumpler 20. We
implement two coarse-to-fine characterization methods: first, we
employ Gaussian mixture models to tag fields around each open cluster
in the proper motion space, and then we apply an unsupervised machine
learning method to make the membership assignment to each cluster. For
the studied clusters, with ages in the ∼120-1900Myr range, we
report an increase of ∼45 per cent new member candidates on
average in our sample. The data-driven selection approach of cluster
members makes our catalogue a valuable resource for testing stellar
evolutionary models and for assessing the cluster low-to-intermediate
mass populations. This study is the first of a series intended to
homogeneously reveal open cluster near-infrared sequences.
Description:
We present the data set of six open stellar clusters down to
Ks∼15/0mag: NGC 6067, NGC 6259, NGC 4815, Pismis 18, Trumpler 23, and
Trumpler 20.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 6 Parameters of our cluster sample
catalog.dat 319 3830 Astronomical data set in eight dimensions
for each of the six cluster
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See also:
J/A+A/633/A99 : Gaia DR2 open clusters in the Milky Way. II
(Cantat-Gaudin+, 2020)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/MNRAS/496/4701 : Gaia-ESO Survey: members of 32 open clusters (Jackson+ 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Cluster Cluster name
12- 18 F7.3 deg RAdeg Right ascension (J2000)
20- 26 F7.3 deg DEdeg Declination (J2000)
28- 33 F6.3 mas/yr pmRA* Proper motion along RA, pmRA*cosDE, from
Cantat-Gaudin & Anders
(2020A&A...633A..99C 2020A&A...633A..99C, Cat. J/A+A/633/A99)
35- 40 F6.3 mas/yr pmDE Proper motion along DE
42- 45 I4 Myr Age Age from Cantat-Gaudin et al.
(2020A&A...640A...1C 2020A&A...640A...1C, Cat. J/A+A/640/A1) (1)
47- 49 I3 Myr e_Age Age from Cantat-Gaudin et al.
(2020A&A...640A...1C 2020A&A...640A...1C, Cat. J/A+A/640/A1) error
51- 55 F5.2 mag (M-m)0J Literature distance modulus from Jackson et al.
(2020MNRAS.496.4701J 2020MNRAS.496.4701J, Cat. J/MNRAS/496/4701)
57- 60 F4.2 mag e_(M-m)0J Literature distance modulus from Jackson et al.
(2020MNRAS.496.4701J 2020MNRAS.496.4701J, Cat. J/MNRAS/496/4701)
error
62- 66 F5.2 mag (M-m)0C Literature distance modulus from Cantat-Gaudin
et al. (2020A&A...640A...1C 2020A&A...640A...1C,
Cat. J/A+A/640/A1)
68- 71 F4.2 mag e_(M-m)0C Literature distance modulus from Cantat-Gaudin
et al. (2020A&A...640A...1C 2020A&A...640A...1C,
Cat. J/A+A/640/A1) error
73- 76 F4.2 mag E(B-V) Redenning from Jackson et al.
(2020MNRAS.496.4701J 2020MNRAS.496.4701J, Cat. J/MNRAS/496/4701)
78- 81 F4.2 mag e_E(B-V) Redenning from Jackson et al.
(2020MNRAS.496.4701J 2020MNRAS.496.4701J, Cat. J/MNRAS/496/4701)
error
83- 86 F4.2 mag Av Extinction from Cantat-Gaudin et al.
(2020A&A...640A...1C 2020A&A...640A...1C, Cat. J/A+A/640/A1)
88- 91 F4.2 mag e_Av Extinction from Cantat-Gaudin et al.
(2020A&A...640A...1C 2020A&A...640A...1C, Cat. J/A+A/640/A1) error
93- 95 I3 --- p1 Number of stars with membership probability
p≥0.9, from Cantat-Gaudin & Anders
(2020A&A...633A..99C 2020A&A...633A..99C, Cat. J/A+A/633/A99)
97- 99 I3 --- N1 Number of recovered sources for p1
101-103 I3 --- p2 Number of stars with membership probability
p≥0.9 from Jackson et al.
(2020MNRAS.496.4701J 2020MNRAS.496.4701J, Cat. J/MNRAS/496/4701)
105-107 I3 --- N2 Number of recovered sources for p2
109-111 I3 --- p3 Number of stars with membership probability
p≥0.9, this work
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Note (1): {DELTA}logt=0.20 (NGC 6067, NGC 6259),
{DELTA}logt=0.15 for the remaining clusters.
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Sequential number within the cluster
6- 21 F16.12 deg RAdeg Right ascension (J2000)
23- 39 F17.13 deg DEdeg Declination (J2000)
41- 58 F18.15 mas/yr pmRA Proper motion along RA, pmRA*cosDE
60- 77 F18.16 mas/yr e_pmRA Proper motion along RA error
79- 99 F21.18 mas/yr pmDE Proper motion along DE
101-118 F18.16 mas/yr e_pmDE Proper motion along DE error
120-135 F16.13 mag Zmag ?=- VVV Z magnitude
137-154 F18.16 mag e_Zmag ?=- VVV Z magnitude error
156-171 F16.13 mag Ymag ?=- VVV Y magnitude
173-190 F18.16 mag e_Ymag ?=- VVV Y magnitude error
192-208 F17.14 mag Jmag 2MASS/VVV J magnitude
210-228 F19.16 mag e_Jmag 2MASS/VVV J magnitude error
230-246 F17.14 mag Hmag 2MASS/VVV H magnitude
248-265 F18.16 mag e_Hmag ?=- 2MASS/VVV H magnitude error
267-283 F17.14 mag Ksmag 2MASS/VVV Ks magnitude
285-303 F19.16 mag e_Ksmag 2MASS/VVV Ks magnitude error
305-308 F4.2 --- Pmemb Membership probability
310-319 A10 --- Cluster Cluster name
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Jan-2024