PHOTOMETRIC METAL ABUNDANCES FOR 20 CLUSTERS

被引：63

作者：

JENNENS, PA ^{[1
]}

HELFER, HL ^{[1
]}

机构：

[1] CEK MEES OBSERV,ROCHESTER,NY 14627

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1975年 / 172卷 / 03期

关键词：

Average values - Galactic plane - Metal abundances - Photometrics;

D O I：

10.1093/mnras/172.3.681

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Metal abundances, colour excesses and distance moduli have been determined for individual giant stars, using UBViyz photometry, in NGC 188, 559, 752, 1245, 1342, 1907, 1912, 2099, 5139 (ω Cen), 5316, 5617, 5822, 5823, 6067, IC 4651, 6819, 6940, 7142, 7261 and 7789. All six clusters with ages 3−8×109 yr have metal abundances agreeing with one another; their average value of [Fe/H] = -0•24±0•05, agrees with the average found for the bright K-giants near the Sun. All six clusters are at least 140 pc from the galactic plane. For the younger clusters less than ~ 109 yr old, one-third are metal deficient. The very young cluster, NGC 559, is probably very metal weak. © 1975 Royal Astronomical Society.

引用

页码：681 / 694

页数：14

共 38 条

[1] INTERMEDIATE-AGE STAR CLUSTERS [J].