SPACE MOTIONS OF GLOBULAR-CLUSTERS NGC-362 AND NGC-6218 (M12)

被引:30
作者
BROSCHE, P
TUCHOLKE, HJ
KLEMOLA, AR
NINKOVIC, S
GEFFERT, M
DOERENKAMP, P
机构
[1] UNIV MUNSTER,INST ASTRON,W-4400 MUNSTER,GERMANY
[2] UNIV CALIF SANTA CRUZ,UNIV CALIF OBSERV,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064
关键词
D O I
10.1086/116024
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We measured the absolute proper motions of NGC 6218 (M12) against distant galaxies and of NGC 362 against stars of the Small Magellanic Cloud (typical accuracy +/- 0".13 cent-1). The results are combined with those of the two studied clusters NGC 4147 and NGC 5466. A variety of parameters is determined within the approximation of a simple Galactic potential, including the description of the last transits of the clusters through the main plane of the Galaxy. The path of the orbits in a meridional section (based on a more refined potential) is provided for the last 10(10) yr. We would like to draw attention to orbits with north-south asymmetry, as exemplified by the tube orbit of NGC 4147.
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页码:2022 / 2027
页数:6
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