TD acknowledges financial support from the Swiss National Science Foundation. We thank the night assistants in Garching and La Silla for their continuous support with the ESO CAT observations and the Variable Star Section of the RASNZ for providing us with the electronic record of their visual estimates of SY Mus. We also thank Rolf Walder for fruitful discussions about numerical simulations of colliding winds in symbiotic binaries, and Hans Martin Schmid and Orsola De Marco for giving valuable comments on the manuscript.
© European Southern Observatory (ESO) 1999
Online publication: August 25, 1999