J/ApJ/948/7 Membership analysis of the region around Tr37 with Gaia (Das+, 2023)
Membership analysis and 3D kinematics of the star-forming complex around
Trumpler 37 using Gaia-DR3.
Das S.R., Gupta S., Prakash P., Samal M., Jose J.
<Astrophys. J., 948, 7 (2023)>
=2023ApJ...948....7D 2023ApJ...948....7D
ADC_Keywords: Star Forming Region; Clusters, open; YSOs; Space velocities;
Proper motions; Magnitudes; Optical
Keywords: Star formation ; Open star clusters ; Star forming regions
Abstract:
Identifying and characterizing young populations of star-forming
regions are crucial to unraveling their properties. In this regard,
Gaia-DR3 data and machine-learning tools are very useful for studying
large star-forming complexes. In this work, we analyze the ∼7.1deg2
area of one of our Galaxy's dominant feedback-driven star-forming
complexes, i.e., the region around Trumpler 37. Using the Gaussian
mixture and random-forest classifier methods, we identify 1243 highly
probable members in the complex, of which ∼60% are new members and are
complete down to the mass limit of ∼0.1-0.2M☉. The spatial
distribution of the stars reveals multiple clusters toward the
complex, where the central cluster around the massive star HD 206267
reveals two subclusters. Of the 1243 stars, 152 have radial velocity,
with a mean value of -16.41±0.72km/s. We investigate stars' internal
and relative movement within the central cluster. The kinematic
analysis shows that the cluster's expansion is relatively slow
compared to the whole complex. This slow expansion is possibly due to
newly formed young stars within the cluster. We discuss these results
in the context of hierarchical collapse and feedback-induced collapse
mode of star formation in the complex.
Objects:
----------------------------------------------------------
RA (ICRS) DE Designation(s)
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21 38 58.8 +57 30 50 IC 1396 = Cl Trumpler 37
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 111 1803 List of the Gaia-based member population
identified using the RF method
table6.dat 127 68 3-dimensional position, heliocentric velocities,
and LSR velocities of the 68 stars within the
cluster C-1; See Sections 4 and 5.1
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)
J/A+A/416/125 : RI photometry in alpha Per and Pleiades (Deacon+, 2004)
J/AJ/128/805 : Low-mass stars in the CephOB2 region (Sicilia-Aguilar+ 2004)
J/AJ/130/188 : Young stars in Tr 37 & NGC 7160 (Sicilia-Aguilar+, 2005)
J/ApJ/638/897 : IR phot. in Trumpler 37 & NGC 7160 (Sicilia-Aguilar+, 2006)
J/AJ/132/2135 : High-resolution sp. in Tr 37 (Sicilia-Aguilar+, 2006)
J/A+A/470/585 : NGC 2682 uvby-Hbeta photometry (Balaguer-Nunez+, 2007)
J/ApJ/654/316 : X-ray sources in IC 1396N (Getman+, 2007)
J/ApJ/669/493 : Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)
J/AJ/135/2323 : Hα stars and HH objects near BRCs (Ikeda+, 2008)
J/ApJ/702/1507 : Mid-IR photometry in IC 1396A (Morales-Calderon+, 2009)
J/ApJ/717/1067 : Triggered star formation in SFO 38 (Choudhury+, 2010)
J/MNRAS/415/103 : IPHAS T Tauri candidates in IC 1396 (Barentsen+, 2011)
J/MNRAS/414/2602 : Automated classification of HIP variables (Dubath+, 2011)
J/MNRAS/426/2917 : X-rays sources in Trumpler 37 (Getman+, 2012)
J/MNRAS/424/2832 : Pulsars in γ-ray sources (Lee+, 2012)
J/MNRAS/422/1495 : UKIDSS Gal. Clusters Survey Pleiades members (Lodieu+ 2012)
J/AJ/143/61 : Hα spectroscopy in IC 1396 HII region (Nakano+, 2012)
J/A+A/538/A74 : Massive binaries in Cepheus OB2/3 region (Peter+, 2012)
J/MNRAS/432/3445 : YSOs on HII complex Sh2-252 (Jose+, 2013)
J/A+A/559/A3 : Low-mass stars in Trumpler 37 (Sicilia-Aguilar+, 2013)
J/MNRAS/443/1614 : YSOs in BRC 5, 7 and 39 (Panwar+, 2014)
J/A+A/566/A122 : JHK and IRAC photometry of Sh2-90 YSOs (Samal+, 2014)
J/A+A/563/A45 : Pleiades cluster membership probabilities (Sarro+, 2014)
J/A+A/573/A19 : Cep OB2 Herschel/PACS view (Sicilia-Aguilar+, 2015)
J/ApJ/822/49 : YSOs in AFGL 333 with NEWFIRM & Spitzer (Jose+, 2016)
J/ApJS/229/28 : SFiNCs: X-ray, IR and membership catalogs (Getman+, 2017)
J/ApJ/836/98 : YSOs search in Stock 8 with opt. to IR photom. (Jose+, 2017)
J/A+A/618/A93 : Gaia DR2 open clusters in the MW (Cantat-Gaudin+, 2018)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diag. (Gaia Collaboration, 2018)
J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)
J/ApJ/869/9 : Machine-learning investigation of M67 (Gao, 2018)
J/AJ/156/121 : Likely open cluster NGC 6405 members (Gao, 2018)
J/A+A/623/A108 : Age of 269 GDR2 open clusters (Bossini+, 2019)
J/ApJ/871/46 : Hectoschelle sp. of 2MASS stars in Cep OB3b (Karnath+, 2019)
J/ApJ/870/32 : Kinematics in young star clusters & assoc. (Kuhn+, 2019)
J/A+A/625/A115 : Ruprecht 147 DANCe. I. (Olivares+, 2019)
J/A+A/643/A148 : Lupus DANCe. Census & 6D structure with Gaia (Galli+, 2020)
J/ApJS/254/42 : Hipparcos-Gaia (EDR3) Cat. of Accelerations (Brandt, 2021)
J/MNRAS/500/3123 : Star formation in the clumps of the NAN complex (Das+, 2021)
J/A+A/646/A46 : Chamaeleon DANCe. Stellar pop. with Gaia-DR2 (Galli+, 2021)
J/MNRAS/508/3388 : Cygnus OB2 Complex survey with Subaru HSC (Gupta+, 2021)
J/ApJ/912/162 : Open clusters in solar neighborhood (Pang+, 2021)
J/AJ/162/279 : 421 YSOs in of IC 1396 with UKIRT/WFCAM (Silverberg+, 2021)
J/A+A/668/A19 : Stellar pop. of Rosette Nebula and NGC 2244 (Muzic+, 2022)
J/ApJ/926/25 : Sh 2-301 & NE cluster multiwavelength study (Pandey+, 2022)
J/A+A/669/A22 : Star formation in IC1396 (Pelayo-Baldarrago+, 2023)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Seq [1/1803] Sequential identifier, this work
6- 24 I19 --- Gaia Source ID from Gaia-DR3 [source_ID]
26- 33 F8.4 deg RAdeg [322.3/328] Right Ascension (ICRS) at Epoch=2016
35- 41 F7.4 deg DEdeg [56.3/59.4] Declination (ICRS) at Epoch=2016
43- 48 F6.3 --- RUWE [0.7/21.4] Gaia DR3 Renormalised unit weight
error
50- 54 F5.3 mas plx [0.8/1.7] Gaia DR3 parallax
56- 60 F5.3 mas e_plx [0.009/0.8] Uncertainty in plx
62- 68 F7.3 mas/yr pmRA [-10.1/-0.16] Gaia DR3 proper motion in RA
70- 74 F5.3 mas/yr e_pmRA [0.01/1.1] Uncertainty in pmRA
76- 81 F6.3 mas/yr pmDE [-7/5.7] Gaia DR3 proper motion in Declination
83- 87 F5.3 mas/yr e_pmDE [0.009/1.1] Uncertainty in pmDE
89- 93 F5.2 mag Gmag [6.7/20.7] Gaia G magnitude
95- 99 F5.2 mag BPmag [6.8/23] Gaia BP magnitude
101-105 F5.2 mag RPmag [6.4/19.2] Gaia RP magnitude
107-111 F5.3 --- PRF [0.6/1] Membership probability (1)
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Note (1): Of the 1803 stars, 1243 have a high-probability value of PRF≥0.8.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq [1/68] Sequential identifier, this table
4- 22 I19 --- Gaia Source ID from Gaia-DR3
24- 31 F8.4 deg RAdeg [324/325.2] Right Ascension (FRAME + EPOCH)
33- 39 F7.4 deg DEdeg [57.3/57.7] Declination (FRAME + EPOCH)
41- 47 F7.2 pc X [-184/-135] Galactic Cartesian coordinate,
toward Galactic Center
49- 55 F7.2 pc Y [832.29/1147.79] Galactic Cartesian coordinate,
in the plan orthogonal to X
57- 62 F6.2 pc Z [82/107] Galactic Cartesian coordinate,
orthogonal to the Galatic plane
64- 68 F5.2 km/s U [8/32] Velocity toward Galactic Center, in the
Heliocentric frame
70- 75 F6.2 km/s V [-74/78] Velocity in direction of Galactic
rotation, in the Heliocentric frame
77- 82 F6.2 km/s W [-18/-2] Velocity toward North Galactic Pole, in
the Heliocentric frame
84- 88 F5.2 km/s uLSR [19/43] Velocity toward Galactic Center,
relative to the Local Standard of Rest (1)
90- 95 F6.2 km/s vLSR [-62/90] Velocity in direction of Galactic
rotation, relative to the Local Standard of Rest
(1)
97- 102 F6.2 km/s wLSR [-11/5.1] Velocity toward North Galactic Pole,
relative to the Local Standard of Rest (1)
104- 109 F6.2 km/s rddv [-61/93] Dot product, position vector and
relative velocity vector
111- 115 F5.2 km/s rxdv1 [-6/22] Cross product, position vector and
relative velocity vector
117- 121 F5.2 km/s rxdv2 [-2/6] Cross product, position vector and
relative velocity vector
123- 127 F5.2 km/s rxdv3 [-8/12] Cross product, position vector and
relative velocity vector
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Note (1): Solar motion assumed to be U0=11.1±0.7km/s,
V0=12.2±0.47km/s, and W0=7.25±0.37 km/s from Schonrich+ 2010MNRAS.403.1829S 2010MNRAS.403.1829S
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Apr-2025