Department of Astronomy,
University of Toronto, Toronto, Ontario, Canada, M5S 1A7
The Be stars are a group of
bright B-type stars with emission lines in their spectra. They vary in
brightness, by up to a few tenths of a magnitude and on time scales of hours up
to years. The nature and cause of this variability are not fully understood.
For these reasons, an international professional-amateur photometric campaign
has recently been organized by Drs. P. Harmanec, J. Horn, and P. Koubsky of the
Ondrejov Observatory of the Czechsolovak Academy of Sciences.
The scope and aims of the
photometric campaign are described. The main problems which are encountered in
campaigns of this sort - achieving precise observations and reducing them to a
standard photometric system - are examined.
Typical light curves of Be
stars, obtained with 0.4 m telescopes at the University of Toronto an da tthe
Kitt Peak National Observatory, will be shown.