J/A+A/623/A108 Age of 269 GDR2 open clusters (Bossini+, 2019)
Age determination for 269 Gaia DR2 open clusters.
Bossini D., Vallenari A., Bragaglia A., Cantat-Gaudin T., Sordo R.,
Balaguer-Nunez L., Jordi C., Moitinho A., Soubiran C., Casamiquela L.,
Carrera R., Heiter U.
<Astron. Astrophys. 623, A108 (2019)>
=2019A&A...623A.108B 2019A&A...623A.108B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, ages ; Stars, distances ; Extinction
Keywords: methods: statistical - open clusters and associations -
catalogs - Galaxy: stellar content
Abstract:
The Gaia Second Data Release provides precise astrometry and
photometry for more than 1.3 billion sources. This catalog opens a new
era concerning the characterization of open clusters and test stellar
models, paving the way for better understanding of the disk
properties.
The aim of the paper is to improve the knowledge of cluster
parameters, using only the unprecedented quality of the Gaia
photometry and astrometry.
We have made use of the membership determination based on the precise
Gaia astrometry and photometry. We applied an automated Bayesian tool,
BASE-9, to fit stellar isochrones on the observed G, GBP, GRP
magnitudes of the high probability member stars.
We derive parameters such as age, distance modulus, and extinction for
a sample of 269 open clusters, selecting only low reddening objects
and discarding very young clusters, for which techniques other than
isochrone-fitting are more suitable for estimating ages.
Description:
Estimated age, distant modulus, and extinction for 269 open clusters
observed in Gaia second data release as delivered in this study.
Summary of joined tables A.1, A.2, and A.3 of the paper.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea.dat 180 269 Summary of OCs parameters characterised in this
study (tables A1-A3)
--------------------------------------------------------------------------------
See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
B/ocl : Optically visible open clusters & Candidates (Dias+ 2002-2015)
J/A+A/558/A53 : Milky Way global survey of star clusters II (Kharchenko+ 2013)
J/A+A/585/A150 : On the metallicity of open clusters. III. (Netopil+, 2016)
J/A+A/601/A70 : GES: pre-main-sequence clusters [Fe/H] (Spina+, 2017)
J/A+A/603/A2 : Gaia-ESO Survey abundances radial distribution (Magrini+ 2017)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diagrams (Gaia Collaboration 2018)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way (Cantat-Gaudin+, 2018)
J/A+A/619/A155 : Open cluster kinematics with Gaia DR2 (Soubiran+, 2018)
Byte-by-byte Description of file: tablea.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 20 A20 --- Cluster Cluster name
21- 30 F10.3 deg RAdeg Mean right ascension of the cluster (ICRS)
at epoch 2015.5
31- 40 F10.3 deg DEdeg Mean declination of the cluster (ICRS)
at epoch 2015.5
41- 50 F10.3 [yr] logA Bayesian estimation of Age (in log t)
51- 60 F10.3 [yr] e_logA 16th percentile confidence level
of Age (in log t)
61- 70 F10.3 [yr] E_logA 84th percentile confidence level
of Age (in log t)
71- 80 F10.3 mag Dist Bayesian estimation of distant modulus
81- 90 F10.3 mag e_Dist 16th percentile confidence level
of distance modulus
91-100 F10.3 mag E_Dist 84th percentile confidence level
of distance modulus
101-110 F10.3 mag AV Bayesian estimation of extinction in V band
111-120 F10.3 mag e_AV 16th percentile confidence level
of extinction in V band
121-130 F10.3 mag E_AV 84th percentile confidence level
of extinction in V band
131-140 F10.3 mag AGTO Extinction in G band (GaiaDR2 Evans et al.,
2018A&A...616A...4E 2018A&A...616A...4E, Cat. I/345) at the turn
off of the cluster
141-150 F10.3 mag e_AGTO 16th percentile confidence level of
extinction in G band at the turn off
151-160 F10.3 mag E_AGTO 84th percentile confidence level of
extinction in G band at the turn off
161-170 F10.3 --- Fe/H Cluster metallicity assumed (in dex)
171-180 A10 --- r_Fe/H Reference for the metallicity assumed (1)
--------------------------------------------------------------------------------
Note (1): References as follows:
HRS = Metallicity from high-quality spectroscopic data
(from Netopil et al., 2016, Cat. J/A+A/585/A150)
GES = Metallicity from Gaia-ESO survey (Spina et al., 2017, Cat. J/A+A/601/A70;
Magrini et al., 2017, Cat. J/A+A/603/A2)
LRS = Metallicity from low-quality spectroscopic data
(from Netopil et al., 2016, Cat. J/A+A/585/A150)
PHC = Metallicity from photometry
(from Netopil et al., 2016, Cat. J/A+A/585/A150)
D02 = Metallicity from Dias et al. (2002A&A...389..871D 2002A&A...389..871D, Cat. B/ocl)
K13 = Metallicity from Kharchenko et al. (2013, Cat. J/A+A/558/A53)
NC = no metallicity reference
--------------------------------------------------------------------------------
Acknowledgements:
Diego Bossini, diego.bossini(at)inaf.it,
Osservatorio astronomico di Padova-INAF
(End) Diego Bossini [Padova-INAF], Patricia Vannier [CDS] 05-Feb-2019