uvby - β PHOTOELECTRIC PHOTOMETRY OF THE OPEN CLUSTERS NGC 1647 AND NGC 1778

被引：0
作者：
Guerrero, C. A. [1 ]
Pena, J. H. [1 ]
Sareyan, J. P. [2 ]
机构：
[1] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico
[2] Observ Paris, Paris, France
来源：
REVISTA MEXICANA DE ASTRONOMIA Y ASTROFISICA | 2011年 / 47卷 / 01期
关键词：
open clusters and associations: individual (NGC 1647; NGC; 1778); techniques: photometric; GALACTIC OPEN CLUSTERS; EMPIRICAL CALIBRATIONS; STANDARD STARS; NGC-1647; SYSTEMS;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present photometry uvby - beta for 35 stars in the direction of the open cluster NGC 1647 and for 16 stars in the direction of the cluster NGC 1778. From the analysis of the data obtained for NGC 1647 we determine a mean reddening of E(b - y) = 0.32 +/- 0.02 mag and a distance modulus of V-0 - M-v = 8.75 +/- 0.09 corresponding to a distance d = 564 +/- 106 pc; also, we find the cluster member stars and a numerical value of log age (in years) = 7.89 +/- 0.23. From the analysis of data obtained for NGC 1778, we conclude that it is not possible to determine whether there is a cluster in that direction, because the distances found for the observed stars are very different.
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页码：185 / 192
页数：8
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