Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system |
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| Authors: | Luigi R Bedin † Santi Cassisi Fiorella Castelli Giampaolo Piotto Jay Anderson Maurizio Salaris Yazan Momany Adriano Pietrinferni |
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| Institution: | Dipartimento di Astronomia, Universitàdi Padova, vicolo dell'Osservatorio 2, I-35122 Padova, Italy;INAF-Osservatorio Astronomico di Collurania, via M. Maggini, 64100 Teramo, Italy;Istituto di Astrofisica Spaziale e Fisica Cosmica, CNR, via del Fosso del Cavaliere, I-00133 Roma, Italy;INAF-Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy;Department of Physics and Astronomy, Mail Stop 108, Rice University, 6100 Main Street, Houston, TX, 77005, USA;Astrophysics Research Institute, Liverpool John Moores University, 12 Quays House, Birkenhead CH41 1LD |
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| Abstract: | We propose a zero-point photometric calibration of the data from the Advanced Camera for Surveys (ACS) Wide Field Channel (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 into a simple observational photometric system for ACS/WFC data, and to 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 from ACS data of five Galactic globular clusters, spanning the metallicity range ?2.2
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| Keywords: | techniques: photometric Hertzsprung–Russell (HR) diagram stars: imaging |
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