Amplitude variability of 4 CVn

M. Breger Institut für Astronomie, Universität Wien,
Türkenschanzstr. 17, A-1180 Wien, Austria
e-mail: breger@dsn.astro.univie.ac.at

The determination of 34 frequencies for 4 CVn by the 15th campaign of the Delta Scuti Network (1996) allowed the reexamination of previous data to determine the amplitude variability of 4 CVn. Details on the frequencies can be found in the previous issue of this newsletter and a paper to appear in A&A. Note that most frequencies were also indepentently seen in 1997 data obtained by the Automatic Photoelectric Telescope (Breger, M. and Hiesberger F., A&A 135, 547, 1999). The resulting variability from 1966 to 1997 is shown on the cover of this newsletter.