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Variable stars in the dwarf irregular galaxy NGC 6822: the photometric catalogue
Deep B,V time-series photometry obtained with the ESO Very Large Telescope
has been used to identify variable stars in the dwarf irregular galaxy NGC
6822. We surveyed a 6.8x6.8 arcmin area of the galaxy and detected a total
number of 390 candidate variables with the optimal image subtraction technique
(Alard 2000). Light curves on a magnitude scale were obtained for 262 of these
variables. Differential flux light curves are available for the remaining
sample. In this paper we present the photometric catalogue of calibrated light
curves and time-series data, along with coordinates and classification of the
candidate variables. A detailed description is provided of the procedures used
to identify the variable stars and calibrate their differential flux light
curves on a magnitude scale.Comment: 22 pages, 19 figures only as JPEG. Revised version with corrected eq.
5. Full text with better resolution .ps figures available upon request from
the authors. Uses aa.cls (included), in press on A&A. Table 2 will only be
published at the CDS, Appendix A, Tables 4,5,6 will only be available in the
electronic edition of the Journa