AAS 201st Meeting, January, 2003
Session 124. WIYN Open Cluster Study
Poster, Thursday, January 9, 2003, 9:20am-4:00pm, Exhibit Hall AB

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[124.05U] WIYN Open Cluster Study: Precision UBVRI Photometry of the Young Open Cluster M36

J. Cummings (Indiana U. and U. Rochester), H. Jacobson (Indiana U. and U. Texas), C. P. Deliyannis, A. Steinhauer (Indiana U.), A. Sarajedini (U. Florida)

We present broad band photometry of the young open cluster M36 to re-evaluate its fundamental parameters. Observations were made during 2002 February 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, allowing for spatially-dependent PSF's and aperture corrections. Using all of U-B, U-V, U-R, and U-I vs B-V color-color diagrams, we find E(B-V) = 0.20+/-0.01+/-sys and [Fe/H] = -0.27+/-0.01+/-sys. Application of Yale- Yonsei isochrones to multiple color-magnitude diagrams yields m-M = 10.80+/-0.03+/-sys and an age in the range 20-40Myr. The relationship between metallicity and Galactic radius in the solar neighborhood is discussed. This REU (Indiana Site) project falls under the auspices of the WIYN Open Cluster Study (WOCS), a collabration between Indiana University, Yale University, the University of Wisconsin, and the National Optical Astronomical Obsevatory (NOAO). This work is supported by NSF Grants AST-0139617 and AST-0206202.

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© 2002. The American Astronomical Soceity.