WIYN Open Cluster Study: (U)BVRI CCD Photometry of a 40'x40' Region of the Young Open Cluster M35

Astronomy and Astrophysics – Astronomy

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We present broad band photometry of the very rich, young open cluster M35. Observations were made in the U, B, V, R, and I filters with the Kitt Peak 0.9m telescope in each of five 23'x23' fields, one (UBVRI) centered on the cluster and four (BVRI) comprising a 2x2 montage. Thus, the total coverage is about 40'x40', representing the largest area of this cluster studied, so far, with CCDs. PSF photometry was performed using DAOPHOT, and standardization was calibrated using two independent photometric nights. We present revised values for the age, distance, and reddening of the cluster, and we study the mass distribution. This project falls under the auspices of the WIYN Open Cluster Study (WOCS), a collaboration between Indiana University, Yale University, the University of Wisconsin, and the National Optical Astronomy Observatory (NOAO). Our results will be used by WIYN/Hydra spectroscopic studies that will follow, to investigate the kinematics and chemical abundances of stars in the cluster. This work is supported by NSF Grant AST-9812735 (to CPD).

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