The Extragalactic Distance Scale Key Project. V. Photometry of the Brightest Stars in M100 and the Calibration of WFPC2
The Astrophysical Journal1998Vol. 496(2), pp. 648–660
Citations Over TimeTop 10% of 1998 papers
Robert Hill, Laura Ferrarese, P. B. Stetson, Abhijit Saha, Wendy L. Freedman, J. A. Graham, J. G. Hoessel, Mingsheng Han, J. P. Huchra, Shaun M. G. Hughes, G. D. Illingworth, Daniel D. Kelson, Robert C. Kennicutt, Fabio Bresolin, Paul Harding, Anne Marie Stewart Turner, Barry F. Madore, Shoko Sakai, N. A. Silbermann, J. R. Mould, Randy L. Phelps
Abstract
We present multiepoch VI observations of the brightest stars in the Virgo spiral galaxy M100 obtained with the WFPC2 aboard the Hubble Space Telescope. Particular attention has been given to the WFPC2 calibration process, and a new calibration is presented here. We find that a calibration based on short exposure (t ≤ 60 sec) observations of the galactic globular clusters ω Cen, Pal 4, and NGC 2419 yields results that are in excellent agreement with the calibration of Holtzmann et al. However, a calibration based on longer exposures (t ≥ 1300 s) yields magnitudes that are systematically brighter by 0.05 mag, on average, in both V and I.
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