J/ApJS/260/8 541 new open cluster candidates (He+, 2022)
New Open Cluster candidates Found in Galactic Disk Using Gaia DR2/EDR3 Data.
He Z., Li C., Zhong J., Liu G., Bai L., Qin S., Jiang Y., Zhang X., Chen L.
<Astrophys. J. Suppl. Ser. 260, 8 (2022)>
=2022ApJS..260....8H 2022ApJS..260....8H (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Parallaxes, trigonometric ;
Proper motions ; Radial velocities
Keywords: open star clusters - star clusters
Abstract:
We report 541 new open cluster candidates in Gaia EDR3 through revisit
the cluster results from an earlier analysis of the Gaia DR2, which
revealed near a thousand open cluster candidates in the solar
neighbourhood (mostly d<3kpc) reside at Galactic latitudes |b|<20
degrees. The subsequent comparison with lists of known clusters shows
greatly increases of the cluster samples within 2kpc from the sun. We
assign membership probabilities to the stars through the open source
pyUPMASK algorithm, and also estimate the physical parameters through
isochrone fitting for each candidate. Most of the new candidates show
small total proper motion dispersion, clear features in the
color-magnitude diagrams. Besides, the metallicity gradient of the new
candidates is consistent with the literature, but it present a deeper
gradient in young subset. The discovery of the new objects shows that
the open cluster samples in Gaia data are still not complete, and more
discoveries are expected in the future researches.
Description:
We reported the finding of 541 new OC candidates based on our previous
search in Gaia DR2 and made the new confirmations using Gaia EDR3. We
applied an open-source procedure, pyUPMASK, to determine the
probabilities of the cluster members. We provided the membership and
median parameters for the new candidates, and also made
classifications based on the CMDs and isochrone fittings.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
params.dat 119 541 Parameters of median astrometric values and isochrone
fits for 541 new open cluster candidates
members.dat 298 66468 Member stars for 541 new OCCs
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
Byte-by-byte Description of file: params.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [CWNU]
6- 8 I3 --- Cluster [1/541] Cluster CWNU ID (cluster)
10- 16 F7.3 deg GLON Galactic longitude (l)
18- 21 F4.2 deg s_GLON Longitude dispersion (sigma_l)
23- 29 F7.3 deg GLAT Galactic latitude (b)
31- 34 F4.2 deg s_GLAT Latitude dispersion (sigma_b)
36- 39 F4.2 mas Plx Parallax (Parallax)
41- 44 F4.2 mas s_Plx Parallax dispersion (sigma_Parallax)
46- 51 F6.2 mas/yr pmRA Proper motion along RA, pmRA*cosDE (pmRA*)
53- 56 F4.2 mas/yr s_pmRA pmRA dispersion (sigma_pmRA*)
58- 63 F6.2 mas/yr pmDE Proper motion along DE (pmDEC)
65- 68 F4.2 mas/yr s_pmDE pmDE dispersion (sigma_pmDEC)
70- 74 A5 km/s RV ?=- Radial velocity (RV)
76- 79 A4 km/s s_RV ?=- RV dispersion (sigma_RV)
81 I1 --- o_RV ?=- Stars used to compute RV (N_RV)
83- 87 F5.2 --- m-M RV dispersion (N_RV>1)|RV error(N_RV=1))
(m-M)
89- 92 F4.2 mag AG G band extinction (A_G)
94- 96 F3.1 [yr] logAge Logarithmic age (log(age/yr))
98-102 F5.3 --- Z Metallicity (Z)
104-106 I3 --- N70 Number of member stars with Pcl>0.7 (N_70)
108-111 F4.2 --- minProb Minimum Pcl used for statistics (min_prob)
113-115 I3 --- NminProb Number of member stars with Pcl>minProb
(Nminprob)
119 I1 --- Class [1/3] Classification (class)
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Byte-by-byte Description of file: members.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [0/66467] Column index (Seq)
7- 25 I19 --- GaiaEDR3 Gaia EDR3 source_id (source_id)
27- 46 F20.16 deg GLON Gaia EDR3 Galactic longitude (l)
48- 71 E24.15 deg GLAT Gaia EDR3 Galactic latitude (b)
72- 90 F19.17 mas Plx Gaia EDR3 Parallax (parallax)
92-111 F20.18 mas e_Plx Gaia EDR3 Parallax error (parallax_error)
113-136 E24.15 mas/yr pmRA Gaia EDR3 proper motion along RA, pmRA*cosDE
(pmra)
137-157 F21.19 mas/yr e_pmRA Gaia EDR3 pmRA error (pmra_error)
159-182 E24.15 mas/yr pmDE Gaia EDR3 proper motion along DE(pmdec)
183-202 F20.18 mas/yr e_pmDE Gaia EDR3 pmDE error (pmdec_error)
204-222 F19.16 mag Gmag Gaia EDR3 G band magnitude (photgmean_mag)
224-245 F22.19 mag BP-RP ? Gaia EDR3 BP-RP (bp_rp)
247-268 F22.17 km/s RV ? Gaia DR2 radial velocity
(dr2radialvelocity)
270-289 F20.17 km/s e_RV ? Gaia DR2 RV error
(dr2radialvelocity_error)
291-294 F4.2 --- Pcl Membership probability Pcl (probs_final)
296-298 I3 --- Cluster [1/541] Cluster CWNU ID (cluster)
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History:
From Zhihong He, hezh(at)mail.ustc.edu.cn
Acknowledgements:
This work has made use of data from the European Space Agency (ESA)
mission GAIA (https: //www.cosmos.esa.int/gaia), processed by the GAIA
ata Processing and Analysis Consortium
(DPAC,https://www.cosmos.esa.int/web/gaia/dpac/consortium) This work
has made use of isochrone data from
http://stev.oapd.inaf.it/cgi-bin/cmd_3.6
(End) Patricia Vannier [CDS] 03-Mar-2022