Multi-site continuous spectroscopy. I: Overview of the MUSICOS 1989 campaign organization

We describe the organization of the multi-site spectroscopic MUSICOS 1989 campaign. This international campaign involved a large number of telescopes distributed around the world. In order to yield a complete time coverage, we had to transport two fiber-fed spectrographs, built at Paris-Meudon Observatory, to remote sites. Three scientific programs were followed during this campaign: 1) search for nonradial pulsations 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 star 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