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

2006/11/29 by Bartosz Fornal, Douglas L. Tucker, J. Allyn Smith +3 · 27 citations
Physics and Astronomy · #Astrometry #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Cluster (spacecraft) #Distance modulus #Filter (signal processing) #Metallicity #Milky Way #Open cluster #Star cluster #Stellar, planetary, and galactic studies #astro-ph

paper · pdf · doi:10.1086/511419

published in The Astronomical Journal 133(4), 1409-1420 (Institute of Physics) · 41 pages, 8 figures. Accepted for publication in the Astronomical Journal

arxiv created 2006/11/29 · openalex publication_date 2007/02/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/08

Abstract

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.

Citations

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