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Issue A&A
Volume 431, Number 3, March I 2005
Page(s) 1189 - 1201
Section On-line catalogs and data
DOI http://dx.doi.org/10.1051/0004-6361:20041684



A&A 431, 1189-1201 (2005)
DOI: 10.1051/0004-6361:20041684

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

L. Baldacci1, 2, L. Rizzi3, 4, G. Clementini1 and E. V. Held3

1  INAF - Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
    e-mail: [lara.baldacci;gisella.clementini]@bo.astro.it
2  Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, 40127 Bologna, Italy
3  INAF - Osservatorio Astronomico di Padova, vicolo dell'Osservatorio 5, 35122 Padova, Italy
    e-mail: held@pd.astro.it
4  Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA
    e-mail: rizzi@ifa.hawaii.edu (Present address)

(Received 17 July 2004/ Accepted 19 October 2004 )

Abstract
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 $6.8\times6.8$ arcmin area of the galaxy and detected a total number of 390 candidate variables with the optimal image subtraction technique (Alard 2000, A&AS, 144, 363). 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.


Key words: galaxies: individual: NGC 6822 -- galaxies: dwarf -- galaxies: irregular -- stars: variables: general -- galaxies: Local Group -- stars: variables: RR Lyr

SIMBAD Objects
Tables at the CDS



© ESO 2005


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