UBVRI and Hα photometry of the young open cluster NGC 6530

被引：83
|
作者：
Sung, H [1 ]
Chun, MY
Bessell, MS
机构：
[1] Bohyun San Opt Astron Observ, Youngcheon 770820, Kyungpook, South Korea
[2] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
来源：
ASTRONOMICAL JOURNAL | 2000年 / 120卷 / 01期
关键词：
color-magnitude diagrams; open clusters and associations : individual (NGC 6530); stars : early-type; stars : pre-main-sequence;
D O I：
10.1086/301450
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
New UBVRI and H alpha photometry has been obtained for the young open cluster NGC 6530 located 10' east of the Lagoon Nebula (M8). We found 37 pre-main-sequence (PMS) stars with Ha emission and nine PMS candidates using the R-H alpha color, a measure of H alpha emission. From this new photometry we derived the cluster parameters (V-0 - M-V = 11.25 +/- 0.1 mag and [E(B-V)] = 0.35 mag), typical age (1.5 Myr), and an age spread of about 5 Myr. We confirmed the presence of a small amount of differential reddening across the cluster. We also verified the abnormal reddening law for the cluster, especially for a heavily embedded O7 V star, Herschel 36. Comparisons were made for several PMS evolution models with regard to the resulting age distribution and the initial mass function.
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页码：333 / 348
页数：16
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