2006A&A...460L..27B


Query : 2006A&A...460L..27B

2006A&A...460L..27B - Astronomy and Astrophysics, volume 460, L27-30 (2006/12-3)

The absolute motion of the peculiar cluster NGC 6791.

BEDIN L.R., PIOTTO G., CARRARO G., KING I.R. and ANDERSON J.

Abstract (from CDS):

We present improved values of the three components of the absolute space velocity of the open cluster NGC 6791. One HST ACS/WFC field with two-epoch observations provides astrometric measurements of objects in a field containing the cluster center. Identification of 60 background galaxies with sharp nuclei allows us to determine an absolute reference point, and measure the absolute proper motion of the cluster. We find (µαcosδ,µδ)J2000.0=(-0.57±0.13,-2.45±0.12)mas/yr, and adopt Vrad=-47.1±0.7km/s from the average of the published values. Assuming a Galactic potential, we calculate the Galactic orbit of the cluster for various assumed distances, and briefly discuss the implications on the nature and the origin of this peculiar cluster.

Abstract Copyright:

Journal keyword(s): astrometry - open clusters and associations: individual: NGC 6791 - Galaxy: kinematics and dynamics

Simbad objects: 3

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Number of rows : 3
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 Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12913 0
2 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 956 0
3 NAME Galactic Bulge reg ~ ~           ~ 3848 0

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2022.05.26-20:09:58

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