Space velocities of southern globular clusters. II. New results for 10 clusters

Citation
Di. Dinescu et al., Space velocities of southern globular clusters. II. New results for 10 clusters, ASTRONOM J, 117(1), 1999, pp. 277-285
Citations number
40
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMICAL JOURNAL
ISSN journal
00046256 → ACNP
Volume
117
Issue
1
Year of publication
1999
Pages
277 - 285
Database
ISI
SICI code
0004-6256(199901)117:1<277:SVOSGC>2.0.ZU;2-Q
Abstract
Absolute proper motions have been measured for 10 clusters, in addition to the sample of five clusters presented in an earlier paper. These newly meas ured clusters are NGC 1904 (M79), NGC 2298, NGC 4590 (M68), NGC 5139 (omega Cen), NGC 5897, NGC 6093 (M80), NGC 6121(M4), NGC 6144, NGC 6809 (M55), an d NGC 7099 (M30). The correction to absolute proper motion is determined ba sed on galaxies, except for one field with high extinction, for which we us ed the Hipparcos system. This latter correction proves to be very useful fo r fields at low Galactic latitude, provided magnitude-dependent systematics are well controlled. The errors in absolute proper motion per cluster rang e between 0.4 and 1.0 mas yr(-1). Space velocities are also determined, and the kinematics are briefly discussed; a companion paper will present a det ailed analysis of orbits in conjunction with other physical parameters of c lusters.