2014AJ....147...69H

Query : 2014AJ....147...69H

2014AJ....147...69H - Astron. J., 147, 69 (2014/April-0)

Radial velocities of three poorly studied clusters and the kinematics of open clusters.

HAYES C.R. and FRIEL E.D.

Abstract (from CDS):

We present radial velocities for stars in the field of the open star clusters Berkeley 44, Berkeley 81, and NGC 6802 from spectra obtained using the Wisconsin-Indiana-Yale-NOAO (WIYN) 3.5 m telescope. These clusters are of intermediate age (1-3 Gyr), located within the solar Galactocentric radius, and have no previous radial velocity measurements. We find mean radial velocities of -9.6±3.0 km/s, 48.1±2.0 km/s, and 12.4±2.8 km/s for Be 44, Be 81, and NGC 6802, respectively. We present an analysis of radial velocities of 134 open clusters of a wide range of ages using data obtained in this study and the literature. Assuming the system of clusters rotates about the Galactic center with a constant velocity, we find older clusters exhibit a slower rotation and larger line-of-sight (LOS) velocity dispersion than younger clusters. The gradual decrease in rotational velocity of the cluster system with age is accompanied by a smooth increase in LOS velocity dispersion, which we interpret as the effect of heating on the open cluster system over time.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: kinematics and dynamics - open clusters and associations: individual: (Be 44, Be 81, NGC 6802)

VizieR on-line data: <Available at CDS (J/AJ/147/69): table1.dat table2.dat table3.dat refs.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1817 OpC 05 12 33.9 +16 41 34           ~ 210 0
2 Cl Berkeley 17 OpC 05 20 30.5 +30 34 20           ~ 192 0
3 Cl King 22 OpC 05 22 09.7 +45 26 30           ~ 81 0
4 M 38 OpC 05 28 40.0 +35 49 08   6.69 6.4     ~ 184 2
5 Cl Berkeley 20 OpC 05 32 36.8 +00 11 06           ~ 129 0
6 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
7 Cl Berkeley 21 OpC 05 51 44.7 +21 48 36   12.26 11.1     ~ 130 0
8 Cl Berkeley 25 OpC 06 41 16.1 -16 28 58           ~ 67 0
9 Cl Berkeley 29 OpC 06 53 03.6 +16 55 24   14.3       ~ 187 0
10 Cl Berkeley 31 OpC 06 57 37.5 +08 17 18           ~ 142 0
11 Cl Berkeley 32 OpC 06 58 06.7 +06 25 53           ~ 164 0
12 Cl Berkeley 39 OpC 07 46 48.1 -04 39 59           ~ 209 1
13 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
14 Cl Berkeley 81 OpC 19 01 39.4 -00 27 10           ~ 93 0
15 Cl Berkeley 44 OpC 19 17 15.4 +19 32 55           ~ 60 0
16 NGC 6791 OpC 19 20 52.8 +37 46 40   10.52 9.5     ~ 1120 0
17 NGC 6802 OpC 19 30 36.3 +20 15 42   10.07 8.8     ~ 115 0
18 NAME CMa Region reg ~ ~           ~ 52 0
19 NAME Monoceros Stream St* ~ ~           ~ 374 1

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