Photometric calibration of the HST wide-field/planetary camera. I - Ground-based observations of standard stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Calibrating, Hubble Space Telescope, Stellar Spectrophotometry, Astronomical Observatories, Interstellar Extinction, Seeing (Astronomy), Stellar Magnitude

Scientific paper

This paper describes the observation and analysis of field stars, undertaken as a step toward understanding the photometric properties of the filters and CCDs aboard the Wide-Field/Planetary Camera of the Hubble Space Telescope. Ground-based CCD observations have been made simulating 15 of the most important WF/PC passbands. Data are presented here for an equatorial network of stars including many UBVRI standards and some spectrophotometric standards. They serve to establish a photometric system that will be used in the calibration of in-flight data and that is useful for the calibration of other ground-based data. Transformations between WF/PC and other photometric systems are discussed, as well as the effects of interstellar absorption and atmospheric extinction on data in the WF/PC system. Synthetic photometry has been used as an aid in the data analysis and is described.

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