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The Astronomical Journal Volume 133 Number 4 Create an alert RSS this journal

Bartosz Fornal et al. 2007 The Astronomical Journal 133 1409 doi:10.1086/511419

A Survey of Open Clusters in the u'g'r'i'z' Filter System. III. Results for the Cluster NGC 188

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Bartosz Fornal1,2,3, Douglas L. Tucker2,4, J. Allyn Smith4,5, Sahar S. Allam2,4,6, Cristin J. Rider7 and Hwankyung Sung8

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Abstract References Cited By

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.


Keywords

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


Dates

Issue 4 (2007 April)

Received 2006 September 1, accepted for publication 2006 November 28

Published 2007 February 26



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