MULTISITE CONTINUOUS SPECTROSCOPY .1. OVERVIEW OF THE MUSICOS 1989 CAMPAIGN ORGANIZATION

We describe the organization of the multi-site spectroscopic MUSICOS 1 989 campaign. This international campaign involved a large number of t elescopes distributed around the world. In order to yield a complete t ime coverage, we had to transport two fiber-fed spectrographs, built a t Paris-Meudon Observatory, to remote sites. Three scientific programs were followed during this campaign: 1) search for nonradial pulsation s in the Be star 48 Per; 2) search for the signature of ''co-rotating interaction regions'' in the wind of the pre-main sequence Herbig Ae s tar AB Aur; 3) Doppler imaging and flare patrol for the RS CVn system HR 1099. The goal of the campaign was to provide a continuous coverage of these three targets in selected spectral lines. Programs 1 and 3 w ere successful, in the sense that the resulting duty cycle was over 80 % for 48 Per and HR 1099. On the other hand, program 2 was unsuccessfu l, due to bad weather at most of the sites during the nights devoted t o AB Aur. Although the initial goal of program 2 was not achieved, the observed spectra indicate an unusual activity level for AB Aur, and t hese results are presented here, while detailed analysis of the result s of programs 1 and 3 will be published separately.