UBVRI and Hα photometry of the young open cluster NGC 6231

被引：84

作者：

Sung, HY ^{[1
]}

Bessell, MS

Lee, SW

机构：

[1] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Weston, ACT 2611, Australia

[2] Seoul Natl Univ, Dept Astron, Seoul 151742, South Korea

来源：

ASTRONOMICAL JOURNAL | 1998年 / 115卷 / 02期

关键词：

color-magnitude diagrams (H-R diagram); open clusters and associations; individual; (NGC; 6231); stars; early-type;

D O I：

10.1086/300207

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

UBVRI and H alpha CCD photometry has been obtained for the young open cluster NGC 6231. From the R - H alpha: color, a measure of the H alpha emission, we find 12 pre-main-sequence (PMS) members and seven possible PMS members in the cluster. Applying recent stellar evolutionary tracks and PMS evolutionary tracks, we derive the age, age spread, and initial mass function of the cluster. The initial mass function of NGC 6231 is a Gaussian with a turnover at log m similar to 0.4 (m similar to 2.5 M.) and shows an abrupt decrease in the number of low-mass stars. Possible reasons for the suppression of low-mass star formation and star formation processes are discussed.

引用

页码：734 / 744

页数：11

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