Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-23
Astron.J.134:195-204,2007
Astronomy and Astrophysics
Astrophysics
To appear in AJ 134, 195
Scientific paper
10.1086/518507
We have measured the absolute proper motions of globular clusters NGC 2808, 3201, 4372, 4833, 5927 and 5986. The proper motions are on the Hipparcos system and they are the first determinations ever made for these low Galactic latitude clusters. The proper motion uncertainties range from 0.3 to 0.5 mas/yr. The inferred orbits indicate that 1) the single metal rich cluster in our sample, NGC 5927, dynamically belongs to the thick disk, 2) the remaining metal poor clusters have rather low-energy orbits of high eccentricity; among these, there appear to be two "pairs" of dynamically associated clusters, 3) the most energetic cluster in our sample, NGC 3201 is on a highly retrograde orbit -- which had already been surmised from its radial velocity alone -- with an apocentric distance of 22 kpc, and 4) none of the metal poor clusters appear to be associated with the recently detected SDSS streams, or with the Monoceros structure. These are the first results of the Southern Proper-Motion Program (SPM) where the second-epoch observations are taken with the CCD camera system recently installed on the double astrograph at El Leoncito, Argentina.
Casetti-Dinescu Dana I.
Castillo D. J.
Girard Terrence M.
Herrera David
Lopez Carlos E. E.
No associations
LandOfFree
Space Velocities of Southern Globular Clusters. V. A Low Galactic Latitude Sample does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Space Velocities of Southern Globular Clusters. V. A Low Galactic Latitude Sample, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Space Velocities of Southern Globular Clusters. V. A Low Galactic Latitude Sample will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-402435