We thank Myron Smith for interesting and inspiring discussions. We thank the staff at the Anglo-Australian Telescope for their expert advice and support. RDO is funded by the Particle Physics and Astronomy Research Council of the United Kingdom. The data analysis facilities are provided by the Starlink Project, which is run by CCLRC on behalf of PPARC. This research is partly based on results from the ESA Hipparcos astrometric satellite.
© European Southern Observatory (ESO) 1999
Online publication: October 4, 1999