J/A+A/675/A67 Cluster aggregates surrounding Pismis 5 in VMR (Qin+, 2023)
Cluster aggregates surrounding Pismis 5 in the Vela Molecular Ridge.
Qin M., Zhang Y., Liu J., Song F., Hu Q., Wang H., Ma S., Lu G.
<Astron. Astrophys. 675, A67 (2023)>
=2023A&A...675A..67Q 2023A&A...675A..67Q (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Parallaxes, trigonometric ; Proper motions ;
Radial velocities ; Photometry ; Optical
Keywords: open clusters and associations: general - Galaxy: stellar content
Abstract:
In the Gaia era, the precision of astrometric data is unprecedented.
High-quality data make it easier to find more cluster aggregates and
support further confirmation of these open clusters.
We use Gaia DR3 to redetermine the open clusters surrounding Pismis 5
in the Vela Molecular Ridge. We also investigate the basic properties
of these clusters.
We apply two clustering algorithms (StarGO and pyUPMASK) to identify
the open cluster members in a five-dimensional space with α,
{deta}, ϖ, µαcosδ and µδ.
We identify eight open clusters surrounding Pismis 5 in the Vela
Molecular Ridge. The open cluster QZ1 is newly discovered. Through
investigating the comprehensive properties of the clusters, one open
binary cluster candidate (Alessi 43 and Collinder 197) and one triple
open cluster candidate (Pismis 5, Pismis 5A, and Pismis 5B) are
discussed.
Binary and triple open cluster candidates have been identified as
potential primordial aggregates based on their similar age, position,
and motion. According to kinematic speculations, the two aggregate
candidates will gradually separate, and their interiors will slowly
disintegrate.
Description:
Using highly precise astrometric data of Gaia DR3, we obtain
eight clusters with a membership probability at least 90% by StarGO
and pyUPMASK. All open clusters are located in the VMR except for
NGC2546. One of eight clusters is discovered by us for the first time,
and it is named as QZ 1. Pismis 5, Pismis 5A and Pismis 5B are
identified as a triple open cluster candidate because of their close
distribution in 3D space and their common kinematics. Alessi 43 and
Collinder 197 are also recognized as a binary open cluster candidate.
Except
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
vmr.dat 288 1572 The member candidates of eight open cluster
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: vmr.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name (1)
15- 22 A8 --- --- [Gaia DR3]
24- 42 I19 --- GaiaDR3 Gaia DR3 source ID
44- 54 F11.7 degree RAdeg Right ascension (ICRS) at Ep=2016
56- 66 F11.9 degree e_RAdeg Standard error of the right ascension
68- 79 F12.8 degree DEdeg Declination (ICRS) at Ep=2016
81- 91 F11.9 degree e_DEdeg Standard error of the declination
93-103 F11.9 mas Plx Absolute stellar parallax
105-115 F11.9 mas e_Plx Standard error on parallax
117-128 F12.9 mas/yr pmRA Proper motion in right ascension direction
130-140 F11.9 mas/yr e_pmRA Standard error of pmra
142-152 F11.9 mas/yr pmDE Proper motion in declination
154-164 F11.9 mas/yr e_pmDE Standard error of pmDE
166-175 F10.7 mag Gmag G-band mean magnitude
177-188 F12.9 mag BP-RP BP-RP colour index
190-201 F12.8 km/s RV ? Radial_velocity
203-214 F12.9 km/s e_RV ? Standard error of radial_velocity
216-226 F11.7 deg GLON Mean Galactic longitude of members
228-239 F12.9 deg GLAT Mean Galactic latitude of members
241-253 F13.8 pc X X coordinate in Galactocentric coordinates
255-267 F13.7 pc Y Y coordinate in Galactocentric coordinates
269-281 F13.9 pc Z Z coordinate in Galactocentric coordinates
283-288 F6.4 --- Pmemb [0/1] Membership probability
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Note (1): Clusters are Alessi 43, BH 56, Collinder 197, NGC 2546, Pismis 5,
Pismis 5A, Pismis 5B and QZ 1.
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Acknowledgements:
Mingfeng Qin, qinmingfeng(at)xao.ac.cn
(End) Mingfeng Qin [Urumqi, Xinjiang, China], Patricia Vannier [CDS] 13-Apr-2023