We describe an extensive observational project that has obtained high-quality and homogeneous photometry for a number of different Galactic star clusters (including M 92, M 13, M 3, M 71, and NGC 6791) spanning a wide range in metallicity (-2.3<[Fe/H]<+0.4), as observed in the u'g'r'i'z' passbands with the MegaCam wide-field imager on the Canada-France-Hawaii Telescope. By employing these purest of stellar populations, fiducial sequences have been defined from color-magnitude diagrams that extend from the tip of the red-giant branch down to approximately 4 magnitudes below the turnoff: these sequences have been accurately calibrated to the standard u'g'r'i'z' system via a set of secondary photometric standards located within these same clusters. Consequently, they can serve as a valuable set of empirical fiducials for the interpretation of stellar populations data in the u'g'r'i'z' system.
Cite
@article{arxiv.0711.4045,
title = {Fiducial Stellar Population Sequences for the u'g'r'i'z' System},
author = {James L. Clem and Don A. VandenBerg and Peter B. Stetson},
journal= {arXiv preprint arXiv:0711.4045},
year = {2009}
}
Comments
16 pages, 7 tables, 13 figures; accepted for publication in AJ