Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system
Abstract
We propose a zero-point photometric calibration of the data from the ACS/WFC on board the Hubble Space Telescope, based on a spectrum of Vega and the most up to date in-flight transmission curves of the camera. This calibration is accurate at the level of a few hundredths of a magnitude. The main purpose of this effort is to transform the entire set of evolutionary models by Pietrinferni et al. (2004) into a simple observational photometric system for ACS/WFC data, and make them available to the astronomical community. We provide the zero points for the most used ACS/WFC bands, and give basic recipes for calibrating both the observed data and the models. We also present the Colour Magnitude Diagram (CMD) from ACS data of 5 Galactic globular clusters, spanning the metallicity range -2.2<[Fe/H]<-0.04, and provide fiducial points representing their sequences from several magnitudes below the turnoff to the red giant branch tip. The observed sequences are compared with the models in the newly defined photometric system.
Keywords
Cite
@article{arxiv.astro-ph/0412328,
title = {Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system},
author = {Luigi R. Bedin and Santi Cassisi and Fiorella Castelli and Giampaolo Piotto and Jay Anderson and Maurizio Salaris and Yazan Momany and Adriano Pietrinferni and .},
journal= {arXiv preprint arXiv:astro-ph/0412328},
year = {2009}
}
Comments
10 pages, 3 figures, 7 Tables. Accepted (2004 Dec 14) on M.N.R.A.S