A Survey of Open Clusters in the u'g'r'i'z' Filter System. 3. Results for the Cluster NGC 188

Journal Article · Wed Nov 01 00:00:00 EST 2006 · Astron.J.133:1409-1420,2007

OSTI ID:897235

Fornal, Bartosz; Tucker, Douglas L; Smith, J Allyn; Allam, Sahar S; Rider, Cristin J; Sung, Hwankyung

The authors continue the 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 they present data only on NGC 188, which is one of the oldest open clusters known in the Milky Way. They fit the Padova theoretical isochrones to the data. Assuming a solar metallicity for NGC 188, they 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.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 897235
• Report Number(s): FERMILAB-PUB-06-431-CD; arXiv eprint number astro-ph/0611900; TRN: US200704%%670
• Journal Information: Astron.J.133:1409-1420,2007, Journal Name: Astron.J.133:1409-1420,2007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
MILKY WAY
SOUTHERN HEMISPHERE
STAR CLUSTERS
Astrophysics