2019ApJ...870...32K


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST04:24:52

2019ApJ...870...32K - Astrophys. J., 870, 32-32 (2019/January-1)

Kinematics in young star clusters and associations with Gaia DR2.

KUHN M.A., HILLENBRAND L.A., SILLS A., FEIGELSON E.D. and GETMAN K.V.

Abstract (from CDS):

The Gaia mission has opened a new window into the internal kinematics of young star clusters at the sub-km s–1 level, with implications for our understanding of how star clusters form and evolve. We use a sample of 28 clusters and associations with ages from ∼1-5 Myr, where lists of members are available from previous X-ray, optical, and infrared studies. Proper motions from Gaia DR2 reveal that at least 75% of these systems are expanding; however, rotation is only detected in one system. Typical expansion velocities are on the order of ∼0.5 km s–1, and in several systems, there is a positive radial gradient in expansion velocity. Systems that are still embedded in molecular clouds are less likely to be expanding than those that are partially or fully revealed. One-dimensional velocity dispersions, which range from σ1D=1 to 3 km s–1, imply that most of the stellar systems in our sample are supervirial and that some are unbound. In star-forming regions that contain multiple clusters or subclusters, we find no evidence that these groups are coalescing, implying that hierarchical cluster assembly, if it occurs, must happen rapidly during the embedded stage.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - open clusters and associations: general - stars: formation - stars: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/ApJ/870/32): table1.dat table3.dat table5.dat fig16.dat>

Simbad objects: 58

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Number of rows : 58

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl Berkeley 59 OpC 00 02 14 +67 25.0           ~ 75 0
2 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1261 1
3 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1134 0
4 IC 348 OpC 03 44 34 +32 09.8           ~ 1255 1
5 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2758 0
6 NAME LkHA 101 Cluster Cl* 04 30 14.0 +35 16 25           ~ 18 0
7 EM* LkHA 101 Em* 04 30 14.438 +35 16 24.03   17.91 15.71 13.33   F 309 1
8 NGC 1893 OpC 05 22 44 +33 24.7   7.90 7.5     ~ 234 0
9 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2057 1
10 * tet01 Ori C ** 05 35 16.4664092288 -05 23 22.897102710 4.20 5.15 5.13 4.91 4.73 O7Vp 1303 1
11 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1509 1
12 M 42 HII 05 35 17.3 -05 23 28           ~ 3794 0
13 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 507 0
14 NAME OMC-2/3 reg 05 35 33.0 -05 00 32           ~ 62 0
15 NAME Ori A MoC 05 38 -07.1           ~ 2760 0
16 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 667 2
17 NGC 2244 OpC 06 31 55 +04 56.5           ~ 573 1
18 NAME Rosette Nebula HII 06 32 26.76 +04 47 37.1           ~ 457 1
19 NAME Rosette Molecular Cloud MoC 06 34.7 +04 02           ~ 233 0
20 NAME S Mon cluster As* 06 40 49.83 +09 51 03.3           ~ 2 0
21 NGC 2264 OpC 06 40 58 +09 53.7           ~ 1627 0
22 * 15 Mon Be* 06 40 58.65963 +09 53 44.7229 3.360 4.400 4.640   4.88 O7V+B1.5/2V 760 0
23 IRAS 06382+0939 Y*O 06 41 02.81160 +09 36 16.1712         19.89 ~ 80 0
24 NAME NGC 2264 IRS 2 Cluster Cl* 06 41 03 +09 36.2           ~ 3 0
25 NAME Cone Nebula DNe 06 41.1 +09 53           ~ 78 1
26 NAME NGC 2264 IRS 1 Cluster Cl* 06 41 10 +09 29.5           ~ 3 0
27 RAFGL 989 Y*O 06 41 10.1592954288 +09 29 33.635497596   17.4 16.8 18.26 17.28 B2 247 0
28 NGC 2362 OpC 07 18 41 -24 57.3           ~ 365 0
29 Cl Trumpler 14 OpC 10 43 56 -59 33.0   5.70 5.5     ~ 448 0
30 Cl Trumpler 15 OpC 10 44 43 -59 22.0   7.41 7.0     ~ 185 0
31 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 918 2
32 Cl Trumpler 16 OpC 10 45 10 -59 43.0   5.35 5.0     ~ 441 0
33 NAME Treasure Chest CGb 10 45 53.0 -59 57 02           ~ 29 2
34 C 1045-598 OpC 10 47 15.2 -60 05 51   8.16 7.9     ~ 73 0
35 NAME Upper Sco Association As* 16 12 -23.4           ~ 1097 1
36 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1170 1
37 NGC 6231 OpC 16 54 08.51 -41 49 36.0   2.83 2.6     ~ 492 0
38 SH 2-3 HII 17 12.4 -38 28           ~ 173 1
39 Cl Pismis 24 OpC 17 24 43.0 -34 12 23   11.00 9.6     ~ 112 0
40 GAL 353.1+00.6 HII 17 25 37 -34 22.5           ~ 16 0
41 GAL 353.2+00.7 HII 17 25 59.77 -34 16 04.4           ~ 5 0
42 NGC 6357 HII 17 26.5 -34 12           ~ 257 0
43 M 20 OpC 18 02 42 -22 58.3           ~ 404 1
44 M 8 HII 18 03 37 -24 23.2           ~ 564 1
45 NGC 6530 OpC 18 04 31 -24 21.5           ~ 362 0
46 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 959 2
47 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1517 0
48 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 970 2
49 NAME Cyg X Cld 20 28 41 +41 10.2           ~ 650 1
50 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 968 0
51 IC 5146 OpC 21 53 24 +47 16.0           ~ 402 2
52 NGC 7160 OpC 21 53 40 +62 36.2   6.34 6.1     ~ 212 0
53 NAME V454 Cep Cluster OpC 22 53 50.830 +62 35 36.37           ~ 9 0
54 V* V454 Cep EB* 22 53 54.0410950658 +62 35 48.366328105 9.34 9.59 9.1     B5 65 0
55 NAME Ass Cep OB 3b As* 22 55 31.19 +62 38 54.1           ~ 33 0
56 NAME Cep B cor 22 57 07.00 +62 37 22.3           ~ 80 0
57 NAME Ass Cep OB 3b As* 23 04.2 +63 24           ~ 22 0
58 NAME Carina Association As* ~ ~           ~ 110 1

    Equat.    Gal    SGal    Ecl

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2021.05.18-04:24:52

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