J/MNRAS/487/2385 Distances and ages of 150 open clusters (Monteiro+, 2019)
Distances and ages from isochrone fits of 150 open clusters using Gaia DR2 data.
Monteiro H., Dias W.S.
<Mon. Not. R. Astron. Soc., 487, 2385-2406 (2019)>
=2019MNRAS.487.2385M 2019MNRAS.487.2385M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Parallaxes, trigonometric ; Proper motions ;
Stars, ages ; Stars, distances ; Optical
Keywords: open clusters and associations: general
Abstract:
We investigate a sample of open cluster candidates with no previous
age determination using astrometric and photometric data from the Gaia
DR2 catalogue. Using proper motions and parallaxes and the full
co-variance matrix we determined the astrometric membership
probability of the stars in the field of each candidate. The
memberships were used as weights in our code based on the
cross-entropy global optimization algorithm to fit theoretical
isochrones to Gaia photometric data of the open clusters. For 150 open
clusters, 49 poorly studied and 101 recently detected, we estimate
distances, ages, reddening, and metallicity from the isochrone fits.
For the 49 candidates from the New Catalog of Optically Visible Open
Clusters and Candidates we also obtain the mean astrometric parameters
proper motion, radial velocity, and parallax. The analysis also
indicates that 80 candidates are likely not real open clusters.
Description:
In this paper, we present the mean proper motions and parallaxes as
well as the astrometric membership probabilities and fundamental
parameters using Gaia DR2 data (Gaia Collaboration
2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345) for 49 open clusters with no
previously determined parameters in the New Catalog of Optically
Visible Open Clusters and Candidates (Dias et al. 2002A&A...389..871D 2002A&A...389..871D,
Cat. B/ocl), hereafter DAML02, and for 101 newly discovered clusters
from Cantat-Gaudin et al. (2018A&A...618A..93C 2018A&A...618A..93C, Cat. J/A+A/618/A93)
and from Cantat-Gaudin et al. (2019A&A...624A.126C 2019A&A...624A.126C, Cat.
J/A+A/624/A126).
A direct consequence of the quality of the Gaia DR2 astrometric data
is the possibility of determining better membership of stars of the
open clusters as shown in Dias et al. (2018MNRAS.481.3887D 2018MNRAS.481.3887D, Cat.
J/MNRAS/481/3887). In a vector proper motion diagram (VPD) of stars in
a region of an open cluster, using Gaia data, it is usually possible
to see clearly the expected clump that is due to the member stars of
the cluster presenting the same spatial velocity. It is also possible
to visualize this clustering when we include parallax and radial
velocity, although the latter has fewer stars with values determined.
The fundamental parameters [distance, age , E(B-V), Rv, and Z] were
determined using our code to fit isochrones to the Gaia DR2
photometric data considering the stars with astrometric membership
greater than 51 per cent.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tableb1.dat 72 49 Fundamental parameter results obtained from
isochrone fits for the DAML02 open clusters
studied
tableb2.dat 93 49 Astrometric parameter results obtained for the
DAML02 open clusters studied
tableb3.dat 71 60 Fundamental parameter results obtained from
isochrone fits for the Gulliver open clusters
studied
tableb4.dat 67 41 Fundamental parameter results obtained from
isochrone fits for the COIN open clusters
studied
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
B/ocl : Optically visible open clusters and Candidates
(Dias+ 2002-2015)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way
(Cantat-Gaudin+, 2018)
J/A+A/624/A126 : New open clusters in Perseus direction
(Cantat-Gaudin+, 2019)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name Cluster name
14- 18 F5.3 [yr] logAge Logarithm of the cluster age
20- 24 F5.3 [yr] e_logAge Error on logAge
26- 30 F5.3 kpc Dist Distance
32- 36 F5.3 kpc e_Dist Error on Dist
38- 42 F5.3 [-] Z Metallicity
44- 48 F5.3 [-] e_Z Error on Z
50- 54 F5.3 mag E(B-V) E(B-V) colour excess
56- 60 F5.3 mag e_E(B-V) Error on E(B-V)
62- 66 F5.3 --- Rv Total-to-selective extinction ratio,
Rv=Av/E(B-V)
68- 72 F5.3 --- e_Rv Error on Rv
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name Cluster name
14- 18 F5.3 mas plx Parallax
20- 24 F5.3 mas e_plx Error on plx
26- 32 F7.3 km/s RV ? Radial velocity
34- 38 F5.3 km/s e_RV ? Error on RV
40- 42 I3 --- Nc Number of cluster members
44- 48 F5.3 --- sigRA Standard deviation of the distribution in
right ascension
50- 54 F5.3 --- e_sigRA Error on sigRA
56- 60 F5.3 --- sigDE Standard deviation of the distribution in
declination
62- 66 F5.3 --- e_sigDE Error on sigDE
68- 74 F7.3 mas/yr pmRA Proper motion in right ascension
76- 80 F5.3 mas/yr e_pmRA Error on pmRA
82- 87 F6.3 mas/yr pmDE Proper motion in declination
89- 93 F5.3 mas/yr e_pmDE Error on pmDE
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Byte-by-byte Description of file: tableb3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Cluster name, Gulliver NN
(Cl Gulliver NN in Simbad)
13- 17 F5.3 [yr] logAge Logarithm of the cluster age
19- 23 F5.3 [yr] e_logAge Error on logAge
25- 29 F5.3 kpc Dist Distance
31- 35 F5.3 kpc e_Dist Error on Dist
37- 41 F5.3 [-] Z Metallicity
43- 47 F5.3 [-] e_Z Error on Z
49- 53 F5.3 mag E(B-V) E(B-V) colour excess
55- 59 F5.3 mag e_E(B-V) Error on E(B-V)
61- 65 F5.3 --- Rv Total-to-selective extinction ratio,
Rv=Av/E(B-V)
67- 71 F5.3 --- e_Rv Error on Rv
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Byte-by-byte Description of file: tableb4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Cluster name, COINNN
([CKS2019] COIN-Gaia NN in Simbad)
8- 12 F5.3 [yr] logAge Logarithm of the cluster age
14- 18 F5.3 [yr] e_logAge Error on logAge
20- 25 F6.3 kpc Dist Distance
27- 31 F5.3 kpc e_Dist Error on Dist
33- 37 F5.3 [-] Z Metallicity
39- 43 F5.3 [-] e_Z Error on Z
45- 49 F5.3 mag E(B-V) E(B-V) colour excess
51- 55 F5.3 mag e_E(B-V) Error on E(B-V)
57- 61 F5.3 --- Rv Total-to-selective extinction ratio,
Rv=Av/E(B-V)
63- 67 F5.3 --- e_Rv Error on Rv
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 14-Nov-2022