Radial-velocity studies of certain multiple systems

R.F. GRIFFIN
Cambridge University Observatories

The speaker has effectively full-time use of the
36-inch reflector on the Cambridge site.  It is used with a
radial-velocity instrument analogous to Mayor's 'Coravel'.
The principal programme of observations is the monitoring of
the radial velocities of a number of stars whose velocities
have been found to change.  They include a small proportion
of systems that are more complicated than simple doubles,
quite apart from the association of additional visual
components to an appreciable proportion of the spectroscopic
binaries.  Progress on a few multiple systems is reported.