Variable stars as tracers of stellar populations in Local Group galaxies: Leo I and NGC 6822

/ Authors

L. Baldacci, F. Matonti, L. Rizzi, G. Clementini, E. Held, Y. Momany, L. Fabrizio, I. D. D. Astronomia, U. Bologna, Italy.

and 8 more authors

I. A. Bologna, I. Padova, D. Astronomia, U. Padova, I. -. T. N. Galileo, Spain., E. Observatory, Chile.

/ Abstract

Results are presented of a study of the variable star populations in the dwarf spheroidal galaxy Leo I and in the dwarf irregular galaxy NGC 6822, based on time series photometry obtained with the Wide Field Imager of the 2.2 m ESO/MPI telescope (Leo I) and the Very Large Telescope (NGC 6822). We found about 250 (lower limit) variables in Leo I most of which are RR Lyrae stars. In NGC 6822 we identified 450 candidate variables among which about 20 are RR Lyrae stars, and many are low-luminosity, small-amplitude Cepheids.

Journal: arXiv: Astrophysics