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Stellar Photometry by Wide Field CCDs: NGC 6822

Published online by Cambridge University Press:  26 July 2016

A. Aparicio ,
C. Gallart  and
J.M. Vílchez
A. Aparicio
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
C. Gallart
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
J.M. Vílchez
Affiliation:
Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain

Abstract

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A wide-field CCD has been used to obtain photometry of resolved stars in the main body of the Local Group Dwarf Irregular Galaxy NGC 6822. Under good seeing conditions, the relatively large pixel size of the chip produces a poor sampling of the stellar profiles. This paper discusses how this undersampling affects the quality of the photometry and shows that this problem can be overcome when the point-spread function is suitably modelled. Finally, a brief discussion of the stellar content of NGC 6822 is given in the light of the [(V-R), V] colour-magnitude diagram.

Type
Part Six: Calibration: Astrometric and Photometric
Information
Symposium - International Astronomical Union , Volume 161: Astronomy from Wide-Field Imaging , 1994 , pp. 305 - 308
Copyright
Copyright © Kluwer 1994 

References

Gallart, C., Aparicio, A. and Vílchez, J.M., 1993b. In the Proceedings of the ESO/OHP Workshop on ‘Dwarf Galaxies’.Google Scholar
Gallart, C., Aparicio, A., Vílchez, J.M., Bertelli, G. and Chiosi, C., 1993a. Astrophys. J. Lett., to be submitted.Google Scholar
Gallart, C., Aparicio, A. and Vílchez, J.M., 1994. Astron. J., to be submitted.Google Scholar
Stetson, P.B., Davis, L.E. and Crabtree, D.E., 1989. In ‘CCDs in Astronomy’, A.S.P. Conf. Series, Vol 8, ed. Jacoby, G.H., p. 289.Google Scholar