J/ApJ/917/21 Stellar kinematics in Orion Complex with Gaia (Swiggum+, 2021)
Evidence for radial expansion at the core of the Orion Complex with Gaia EDR3.
Swiggum C., D'Onghia E., Alves J., Grossschedl J., Foley M., Zucker C.,
Meingast S., Chen B., Goodman A.
<Astrophys. J., 917, 21 (2021)>
=2021ApJ...917...21S 2021ApJ...917...21S
ADC_Keywords: Radial velocities; Proper motions; Star Forming Region;
Stars, ages; Associations, stellar; Optical
Keywords: Star forming regions ; Stellar feedback ; Stellar associations ;
Stellar ages ; Stellar dynamics
Abstract:
We present a phase-space study of two stellar groups located at the
core of the Orion Complex: Briceno-1 and Orion Belt Population-near
(OBP-near). We identify the groups with the unsupervised clustering
algorithm, Shared Nearest Neighbor (SNN), which previously identified
12 new stellar substructures in the Orion Complex. For each of the
two groups, we derive the 3D space motions of individual stars using
Gaia-EDR3 proper motions supplemented by radial velocities from
Gaia-DR2, APOGEE-2, and GALAH DR3. We present evidence for radial
expansion of the two groups from a common center. Unlike previous
work, our study suggests that evidence of stellar group expansion is
confined only to OBP-near and Briceno-1, whereas the rest of the
groups in the complex show more complicated motions. Interestingly,
the stars in the two groups lie at the center of a dust shell, as
revealed via an extant 3D dust map. The exact mechanism that produces
such coherent motions remains unclear, while the observed radial
expansion and dust shell suggest that massive stellar feedback could
have influenced the star formation history of these groups.
Description:
Chen+ (2020A&A...643A.114C 2020A&A...643A.114C) applied two clustering algorithms, namely,
Shared Nearest Neighbor (SNN; Chen+ 2018ApJ...860...70C 2018ApJ...860...70C) and EnLink
(Sharma & Johnston 2009ApJ...703.1061S 2009ApJ...703.1061S), to Gaia DR2 in the vicinity
of Orion, to uncover stellar groups clustered in R.A., decl.,
parallaxes and proper motions. We query the Gaia EDR3 database using
the same region selection for Orion as used in Chen et al. (2020);
see Section 2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 15 Summary of Shared Nearest Neighbor (SNN) groups
table2.dat 257 5020 Shared Nearest Neighbor (SNN) catalog
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/A+A/289/101 : Orion OB1 association. I. (Brown+, 1994)
J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)
J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/MNRAS/424/1925 : Spectrocopic Binarity of O and B type stars (Chini+, 2012)
J/A+A/584/A26 : Cosmography of OB stars in solar neighbourhood (Bouy+, 2015)
J/AJ/153/188 : Spectroscopy of the foreground pop. in Orion A (Fang+, 2017)
J/A+A/608/A148 : Stellar populations towards Orion with GaiaDR1 (Zari+, 2017)
J/ApJS/236/27 : APOGEE-2 survey of Orion Complex (OSFC). I. (Cottle+, 2018)
J/A+A/619/A106 : 3D shape of Orion A from Gaia DR2 (Grossschedl+, 2018)
J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)
J/A+A/626/A17 : Young pop. in Vela-Puppis region (Cantat-Gaudin+, 2019)
J/A+A/622/A149 : Vienna survey in Orion. III. (Grossschedl+, 2019)
J/A+A/631/A166 : Members of 5 cluster in Ori OB1a association (Kos+, 2019)
J/ApJ/870/32 : Kinematics in young star clusters & assoc. (Kuhn+, 2019)
J/MNRAS/486/2477 : Catalogue of members of NGC 6530 (Wright+, 2019)
J/ApJ/899/128 : Members of NGC7000/IC5070 Complex (Kuhn+, 2020)
J/MNRAS/495/663 : Gaia DR2 OB associations (Ward+, 2020)
J/A+A/633/A51 : Distances to molecular clouds in SFR (Zucker+, 2020)
J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Group [1/24] Original SNN group label assigned by
Chen+ (2020A&A...643A.114C 2020A&A...643A.114C)
4- 21 A18 --- Name Name of the group
23- 25 I3 --- Stab [41/383] Stability score from SNN
27- 29 I3 --- Ns [85/909] Number of stars in group
31- 34 F4.1 Myr Age [3.1/22.5] Age of group
36- 38 F3.1 Myr e_Age [1.5/6.9] Lower uncertainty on Age
40- 42 F3.1 Myr E_Age [0.9/9.8] Upper uncertainty on Age
44- 46 F3.1 mag Av [0.2/0.6] Extinction of group
48- 51 F4.1 % DR2p [58/84.3] Percent of group's stars from
Chen+ (2020A&A...643A.114C 2020A&A...643A.114C) that are coincident
with present work's stellar membership
53- 56 F4.1 deg RAdeg [78.5/88] Average right ascension
58- 60 F3.1 deg e_RAdeg [0.4/1.5] RAdeg 1σ uncertainty
62- 65 F4.1 deg DEdeg [-8.1/9.7] Average declination
67- 69 F3.1 deg e_DEdeg [0.6/2.2] DEdeg 1σ uncertainty
71- 75 F5.1 pc Dist [285/446] Average distance
77- 80 F4.1 pc e_Dist [11/31] Dist 1σ uncertainty
82- 85 F4.1 mas/yr pmRA [-3.3/2] Average pmRA
87- 89 F3.1 mas/yr e_pmRA [0.2/0.4] pmRA 1σ uncertainty
91- 94 F4.1 mas/yr pmDE [-3/0.8] Average pmDE
96- 98 F3.1 mas/yr e_pmDE [0.2/0.3] pmDE 1σ uncertainty
100- 103 F4.1 km/s HRV [14/33] Average heliocentric RV
105- 108 F4.1 km/s e_HRV [3/77] HRV 1σ uncertainty
110- 112 I3 --- Nrv [2/197] Number of available RVs from Gaia DR2,
APOGEE-2, and GALAH DR3
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Group [1/24] Shared nearest neighbor (SNN)
label (as in Table 1)
4- 22 I19 --- GaiaDR3 Gaia EDR3 source ID
24- 40 F17.14 deg RAdeg [75.18/89.88] Right Ascension, Gaia DR3 (ICRS)
at Epoch=2016.0
42- 53 F12.10 deg e_RAdeg [0.007/1.11] Uncertainty in RAdeg
55- 74 F20.16 deg DEdeg [-14.3/13.1] Declination, Gaia DR3 (ICRS)
at Epoch=2016.0
76- 87 F12.10 deg e_DEdeg [0.006/1.1] Uncertainty in DEdeg
89-106 F18.16 mas Plx [2/4.1] Parallax, Gaia DR3
108-119 F12.10 mas e_Plx [0.01/0.7] Uncertainty in Plx
121-142 F22.19 mas/yr pmRA [-3.84/2.5] Proper motion in RA, Gaia DR3
144-155 F12.10 mas/yr e_pmRA [0.01/1.1] Uncertainty in pmRA
157-178 F22.19 mas/yr pmDE [-3.5/1.5] Proper motion in DE, Gaia DR3
180-191 F12.10 mas/yr e_pmDE [0.008/1.1] Uncertainty in pmDE
193-203 F11.7 km/s RVel1 [-24.8/52.8]? Gaia DR2 radial velocity
205-215 F11.8 km/s e_RVel1 [0.27/20]? Uncertainty in RVel1
217-225 F9.5 km/s RVel2 [-22/633]? APOGEE-2 radial velocity
227-233 F7.5 km/s e_RVel2 [0.01/5.7]? Uncertainty in RVel2
235-243 F9.6 km/s RVel3 [3.6/91.3]? GALAH DR3 radial velocity
245-252 F8.6 km/s e_RVel3 [0.3/3]? Uncertainty in RVel3
254-257 F4.2 --- Prob [0.02/1] SNN probability
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-Jan-2023