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Calibration of Hipparcos Long Period Variable Star Fields Using Multi-Color CCD Observations

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Steve B. Howell

Planetary Science Institute, 620 N. 6th Avenue, Tucson, AZ 85705

Janet A. Mattei

American Association of Variable Star Observers, 25 Birch Street, Cambridge, MA 02138

Priscilla J. Benson

Whitin Observatory, Wellesley College, Wellesley, MA 02181

Adriana Reyes

Presented at the 3rd AAVSO CCD Workshop, June 6, 1993

Abstract

The first set of 4-color AAVSO CCD finder charts has been prepared using the 0.9-m telescope at Kitt peak national Observatory in Arizona. The stars selected were northern long period variable stars observed with the Hipparcos astrometric satellite, since multicolor photometry was needed on these stars to calibrate and reduce the photometric and astrometric data obtained by the satellite. We describe the criteria in choosing the stars for which to prepare CCD finder charts, the observation process, and the reduction of the CCD to obtain 4-color CCD magnitude sequences to use in the creation of AAVSO finder charts.