Often in astronomy one looks for one thing and finds another. The FGS are also very good photometers. Proxima Centauri turned out to be a periodic variable star. The announcement paper was based on less than half the data sets we have now. The period may have changed to 82 days from the originally announced 41 days. Finally, here is an example of the periodograms which we use in our search. The only frequency for which there is any power in both x and y is near 0.013 /day. We remain skeptical that it is an astronomical effect.
Here is some information about Barnard's Star . We are in the middle of our series of observations of this object. They will continue through 1995-6 (Cycle 5). Thus far, neither astrometric nor radial velocity measurements have yielded a planet.