2019MNRAS.487.2977G


Query : 2019MNRAS.487.2977G

2019MNRAS.487.2977G - Mon. Not. R. Astron. Soc., 487, 2977-3000 (2019/August-2)

Gaia stellar kinematics in the head of the Orion A cloud: runaway stellar groups and gravitational infall.

GETMAN K.V., FEIGELSON E.D., KUHN M.A. and GARMIRE G.P.

Abstract (from CDS):

This work extends previous kinematic studies of young stars in the head of the Orion A cloud (OMC-1/2/3/4/5). It is based on large samples of infrared, optical, and X-ray selected pre-main-sequence stars with reliable radial velocities and Gaia-derived parallaxes and proper motions. Stellar kinematic groups are identified assuming they mimic the motion of their parental gas. Several groups are found to have peculiar kinematics: the NGC 1977 cluster and two stellar groups in the extended Orion nebula (EON) cavity are caught in the act of departing their birthplaces. The abnormal motion of NGC 1977 may have been caused by a global hierarchical cloud collapse, feedback by massive Ori OB1ab stars, supersonic turbulence, cloud-cloud collision, and/or slingshot effect; the former two models are favoured by us. EON groups might have inherited anomalous motions of their parental cloudlets due to small-scale 'rocket effects' from nearby OB stars. We also identify sparse stellar groups to the east and west of Orion A that are drifting from the central region, possibly a slowly expanding halo of the Orion nebula cluster. We confirm previously reported findings of varying line-of-sight distances to different parts of the cloud's Head with associated differences in gas velocity. 3D movies of star kinematics show contraction of the groups of stars in OMC-1 and global contraction of OMC-123 stars. Overall, the head of Orion A region exhibits complex motions consistent with theoretical models involving hierarchical gravitational collapse in (possibly turbulent) clouds with OB stellar feedback.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: early-type - stars: formation - stars: pre-main sequence - open clusters and associations: general - infrared: stars - X-rays: stars

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4012 0
2 NAME f-Shaped Filament in Orion Cld 05 35.0 -05 30           ~ 99 0
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2173 1
4 HD 36958 Or* 05 35 04.7875827888 -04 43 54.626071800 6.68 7.22 6.90     B3/5V 95 0
5 NGC 1973 GNe 05 35 04.80 -04 43 54.7           ~ 16 0
6 HD 294264 Or* 05 35 13.3447259856 -04 51 44.916838992   10.02 9.77     B2.5V 63 0
7 NAME OMC 1 Cluster Cl* 05 35 14 -05 22.5           ~ 17 0
8 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2176 1
9 NGC 1980 OpC 05 35 14 -05 55.4     2.5     ~ 99 0
10 NAME OMC 1S PoC 05 35 14.5 -05 25 49           ~ 73 1
11 NGC 1977 OpC 05 35 16.0 -04 49 15           ~ 212 0
12 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1558 1
13 M 42 HII 05 35 17.3 -05 23 28           ~ 3935 0
14 NAME Ori Complex Cld 05 35.3 -05 23           ~ 395 0
15 NGC 1975 GNe 05 35 18.1 -04 41 05           ~ 17 0
16 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 252 1
17 * c Ori Y*O 05 35 23.16427 -04 50 18.0881 3.46 4.40 4.59 4.67 4.85 B1V+? 208 0
18 OMC 5 MoC 05 35.4 -05 55           ~ 24 0
19 OMC 2 MoC 05 35 27 -05 10.1           ~ 433 1
20 HD 37061 Or* 05 35 31.3649044920 -05 16 02.582064192 6.44 7.09 6.83     O9.5V 344 0
21 NAME OMC-2/3 reg 05 35 33.0 -05 00 32           ~ 79 0
22 HD 37058 Or* 05 35 33.3539646576 -04 50 15.181113696 6.40 7.18 7.30     B3/5II 155 0
23 OMC 4 MoC 05 36 06 -05 35.7           ~ 64 0
24 NAME LDN 1641 North HII 05 36 17.6 -06 22 10           ~ 231 0
25 NAME Ori A MoC 05 38 -07.1           ~ 2868 0
26 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1286 0
27 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1116 1
28 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1008 1
29 NAME eta Cha Association OpC 08 42 33 -78 57.8           ~ 342 0
30 NAME TW Hya Association As* 11 01.9 -34 42           ~ 895 0
31 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 687 0
32 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1245 1

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2022.09.28-09:23:41

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