AAS 203rd Meeting, January 2004
Session 14 Open Clusters
Poster, Monday, January 5, 2004, 9:20am-6:30pm, Grand Hall

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[14.07] WIYN Open Cluster Study: Precision UBVRI CCD Photometry of the Open Cluster NGC 2539

K. W. Vogel (Indiana U. and U. Nebraska, Kearney), E. K. Braden (Indiana U. and Whitman), C. P. Deliyannis, A. Steinhauer, H. Jacobson (Indiana U.)

We present broad band photometry of the Hyades-aged open cluster NGC 2539 to re-evaluate its fundamental parameters. Observations were made on 17 January 2003 in the U, B, V, R, I filters with the WIYN 0.9m telescope in a central 20'x20' field. PSF photometry was performed using Daophot II, allowing for spatially-dependent PSF's and aperature corrections. Using U-B, U-V, and U-R (vs. B-V) color-color diagrams, we found E(B-V) = 0.07+/-0.01+/-sys and [Fe/H] = -0.09+/-0.05+/-sys. Application of Yale-Yonsei 2002 isochrones to multiple color-magnitude diagrams yields m-M = 10.65+/-0.05+/-sys, D = 1215+/-30+/-sys pc and an age = 650+/-25+/-sys Myr. This REU (Indiana Site) project falls under the WIYN Open Cluster Study (WOCS), a collaboration between Indiana University, Yale University, the University of Wisconsin, and the National Optical Astronomical Observatory (NOAO). This work is supported by NSF grants AST-1039617 and AST-0206202.

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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.