A survey of open clusters in the u′g′r′i′z′ filter system.: III.: Results for the cluster NGC 188

被引：24

作者：

Fornal, Bartosz ^{[1
]}

Tucker, Douglas L.

Smith, J. Allyn

Allam, Sahar S.

Rider, Cristin J.

Sung, Hwankyung

机构：

[1] Jagiellonian Univ, Inst Phys, Krakow, Poland

[2] Fermilab Natl Accelerator Lab, Internship Undergrad Phys Majors Program, Batavia, IL 60510 USA

[3] Austin Peay State Univ, Dept Phys & Astron, Clarksville, TN 37044 USA

[4] Univ Wyoming, Dept Phys & Astron, Laramie, WY 82071 USA

[5] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[6] Sejong Univ, Dept Astron & Space Sci, Seoul, South Korea

来源：

ASTRONOMICAL JOURNAL | 2007年 / 133卷 / 04期

基金：

美国国家科学基金会;

关键词：

Hertzsprung-Russell diagram; open clusters and associations : individual (NGC 188); stars : abundances;

D O I：

10.1086/511419

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We continue our series of papers describing the results of a photometric survey of open star clusters, primarily in the southern hemisphere, taken in the u'g'r'i'z' filter system. The entire observed sample covered more than 100 clusters, but here we present data only on NGC 188, which is one of the oldest open clusters known in the Milky Way. We fit the Padova theoretical isochrones to our data. Assuming a solar metallicity for NGC 188, we find a distance of 1700 +/- 100 pc, an age of 7.5 +/- 0.7 Gyr, and a reddening E(B-V) of 0.025 +/- 0.005. This yields a distance modulus of 11.23 +/- 0.14.

引用

页码：1409 / 1420

页数：12

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