出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present the results from a large observing campaign where we obtained 61 medium resolution
spectra spread over three months. We thus cover roughly five orbits and about half a precession
phase. In this paper we describe the analysis of the so-called "stationary" emission lines, which
we use to compute Doppler-maps of the emission distribution in the SS433-system. The radial
velocities of the individual line components have been analysed. Periodic variations with the
orbital period are confirmed, but also variations on longer timescales are found. These long-term
variation might be either either related to the precession phase or to some transient phenomen.
