J/ApJ/937/L7 Collinder132-Gulliver21 stream members from Gaia DR3 (Pang+, 2022)
Dynamical origin for the Collinder 132-Gulliver 21 stream: a mixture of three
comoving populations with an age difference of 250Myr.
Pang X., Li Y., Tang S.-Y., Wang L., Wang Y., Li Z.-Y., Wang D.,
Kouwenhoven M.B.N., Pasquato M.
<Astrophys. J., 937, L7 (2022)>
=2022ApJ...937L...7P 2022ApJ...937L...7P
ADC_Keywords: Associations, stellar; Clusters, open; Proper motions;
Parallaxes, trigonometric; Radial velocities; Stars, masses;
Stars, distances; Magnitudes; Optical; Surveys
Keywords: Star clusters ; Open star clusters ; Stellar kinematics ;
Moving clusters
Abstract:
We use Gaia DR3 data to study the Collinder 132-Gulliver 21 region via
the machine-learning algorithm StarGO and find eight subgroups of
stars (ASCC 32, Collinder 132 gp 1-6, Gulliver 21) located in close
proximity. Three comoving populations were identified among these
eight subgroups: (i) a coeval 25Myr old moving group (Collinder 132),
(ii) an intermediate-age (50-100Myr) group, and (iii) the 275Myr old
dissolving cluster Gulliver 21. These three populations form parallel
diagonal stripe-shape overdensities in the U-V distribution, which
differ from open clusters and stellar groups in the solar
neighborhood. We name this kinematic structure the Collinder
132-Gulliver 21 stream, as it extends over 270pc in the 3D space. The
oldest population, Gulliver 21, is spatially surrounded by the
Collinder 132 moving group and the intermediate-age group. Stars in
the Collinder 132-Gulliver 21 stream have an age difference up to
250Myr. Metallicity information shows a variation of 0.3dex between
the youngest and oldest populations. The formation of the
Collinder 132-Gulliver 21 stream involves both star formation and
dynamical heating. The youngest population (Collinder 132 moving
group) with homogeneous metallicity is probably formed through
filamentary star formation. The intermediate-age and oldest
populations were then scattered by the Galactic bar or spiral
structure resonance to intercept Collinder 132's orbit. Without mutual
interaction between each population, the three populations are flying
by each other currently and will become three distinct groups again in
∼50Myr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 8 General properties of eight subgroups in the
Collinder 132-Gulliver 21 stream
tableb1.dat 198 1496 Individual members of the eight subgroups in
Collinder132-Gulliver21 stream
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/ApJ/649/759 : Bubbles in the galactic disk (Churchwell+, 2006)
J/ApJ/670/428 : Bubbles in the galactic disk. II. (Churchwell+, 2007)
J/MNRAS/424/2442 : Catalog of bubbles from Milky Way Project (Simpson+, 2012)
J/ApJ/764/73 : HST VI phot. of HD 97950 cluster members stars (Pang+, 2013)
J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)
J/MNRAS/438/426 : Spitzer interstellar bubbles (Hou+, 2014)
J/A+A/618/A93 : Gaia DR2 open clusters in the MW (Cantat-Gaudin+, 2018)
J/A+A/627/A119 : Extended halo of NGC 2682 (M 67) (Carrera+ 2019)
J/AJ/158/122 : Local structure & SFH of the MW (Kounkel+, 2019)
J/ApJS/245/32 : Newly identified star clusters in Gaia DR2 (Liu+, 2019)
J/ApJ/885/131 : High-mass SFR plx & proper motion with VLBI (Reid+, 2019)
J/ApJ/877/12 : ComaBer & a Neighbor Stellar Group tidal tails (Tang+, 2019)
J/A+A/640/A1 : Portrait Galactic disc (Cantat-Gaudin+, 2020)
J/MNRAS/493/351 : A large catalogue of molecular clouds (Chen+, 2020)
J/A+A/642/A179 : beta Pic moving group RV of 81 stars (Miret-Roig+, 2020)
J/ApJ/891/39 : LAMOST very metal-poor stars of the Gal. halo (Yuan+, 2020)
J/ApJ/912/162 : Open clusters in solar neighborhood (Pang+, 2021)
J/ApJ/923/20 : Hierarchical clustering in Vela OB2 complex (Pang+, 2021)
J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)
J/A+A/657/L3 : Rot. periods of Group X candidate members (Messina+, 2022)
J/ApJ/931/156 : 3D morphology of open cl. with Gaia EDR3. II. (Pang+, 2022)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- Cluster Cluster identifier
19- 28 F10.6 deg RAdeg [105.7/111.7] Right ascension (ICRS) at
Ep=2016 (1)
30- 39 F10.6 deg DEdeg [-31.1/-25.4] Declination (ICRS) at Ep=2016 (1)
41- 45 F5.1 pc Dist [599.4/795.2] Corrected distance (1)
47- 52 F6.1 pc Xc [-416.7/-270.2] Corrected Heliocentric
Cartesian X coordinate (1)
54- 59 F6.1 pc Yc [-686.4/-506.1] Corrected Heliocentric
Cartesian Y coordinate (1)
61- 66 F6.1 pc Zc [-133.9/-69.8] Corrected Heliocentric
Cartesian Z coordinate (1)
68- 71 F4.1 km/s RV [21.7/39.8] Radial velocity (1)
73- 78 F6.3 mas/yr pmRA [-5/-1.9] Proper motion in right ascension
(pmRA*cosDE) (1)
80- 84 F5.3 mas/yr pmDE [3.4/6.4] Proper motion in declination (1)
86- 88 I3 Myr Age [25/275] Age derived from PARSEC isochrone
fitting (Figure 1)
90- 94 F5.1 Msun Mcl [39/578] Total mass of the subgroup
96- 99 F4.1 pc rh [9/28.7] Half-mass radius of the subgroup
101-104 F4.1 pc rt [4.8/11.7] Tidal radius using Equation 12 in
Pinfield 1998MNRAS.299..955P 1998MNRAS.299..955P
106-108 I3 --- N [40/519] Total number of members
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Note (1): The median values of the subgroup member properties.
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Cluster Cluster identifier
19- 37 I19 --- GaiaDR3 Gaia DR3 identifier
39- 51 F13.9 deg RAdeg [102.9/113.7] Gaia DR3 Right Ascension (ICRS)
at Ep=2016.0
53- 56 F4.2 mas e_RAdeg [0.01/0.12] Uncertainty in RAdeg
58- 70 F13.9 deg DEdeg [-35.2/-20.9] Gaia DR3 Declination (ICRS) at
Ep=2016.0
72- 75 F4.2 mas e_DEdeg [0.01/0.15] Uncertainty in DEdeg
77- 80 F4.2 mas plx [1.17/1.87] Gaia DR3 parallax
82- 85 F4.2 mas e_plx [0.01/0.17] Uncertainty in plx
87- 91 F5.2 mas/yr pmRA [-5.54/-1.46] Gaia DR3 proper motion along RA
93- 96 F4.2 mas/yr e_pmRA [0.01/0.16] Uncdrtainty in pmRA
98- 101 F4.2 mas/yr pmDE [2.68/6.76] Gaia DR3 proper motion along DE
103- 106 F4.2 mas/yr e_pmDE [0.01/0.19] Uncdrtainty in pmDE
108- 114 F7.4 mag Gmag [6.3/19] Gaia DR3 G band magnitude
116- 122 F7.4 mag Bpmag [6.2/21] Gaia DR3 Blue passband magnitude
124- 130 F7.4 mag Rpmag [6.5/18] Gaia DR3 Red passband magnitude
132- 138 F7.1 km/s RV [-39.2/95.5]?=-9999 Gaia DR3 radial velocity
140- 146 F7.1 km/s e_RV [0.1/40]?=-9999 Uncertainty in RV
148- 150 F3.1 Msun Ms [0.3/9] Stellar mass from this study
152- 157 F6.1 pc Xo [-461/-234] Heliocentric Cartesian X
coordinate (1)
159- 164 F6.1 pc Yo [-724/-444] Heliocentric Cartesian Y
coordinate (1)
166- 171 F6.1 pc Zo [-162/-42] Heliocentric Cartesian Z
coordinate (1)
173- 178 F6.1 pc Xc [-453/-235] Corrected Heliocentric Cartesian
X coordinate (2)
180- 185 F6.1 pc Yc [-708/-461] Corrected Heliocentric Cartesian
X coordinate (2)
187- 192 F6.1 pc Zc [-162/-42] Corrected Heliocentric Cartesian X
coordinate (2)
194- 198 F5.1 pc Dist [569/836.5] Corrected distance
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Note (1): Computed via direct inverting Gaia DR3 parallax.
Note (2): After distance correction in this study.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Aug-2024