Variable stars in the dwarf irregular galaxy NGC 6822: the photometric catalogue

Details Variable stars in the dwarf irregular galaxy NGC 6822: the photometric catalogue Variable stars in the dwarf irregular galaxy NGC 6822: the photometric catalogue

2004-11-05

arxiv.org/abs/astro-ph/0411137v2

Astronomy and Astrophysics

Astrophysics

22 pages, 19 figures only as JPEG. Revised version with corrected eq. 5. Full text with better resolution .ps figures availabl

Scientific paper

10.1051/0004-6361:20041684

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.

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