  We present preliminary results of a our search for close (period P < 10 days)
binary systems among hot (Teff > 20000 K) horizontal branch stars in globular
clusters M80 and NGC5986. We measured radial velocity variations of 11 targets
in M80 and 5 in NGC5986, spectroscopically observed at medium resolution
(R=4100) during four nights at VLT-FORS2. We found one close binary candidate
in M80, showing statistically significative radial velocity variations, and no
clear evidence in NGC5986. These results confirm the lack of close binaries
among hot horizontal branch stars in globular clusters, as already found in
NGC6752, at variance with what observed among hot subdwarfs in the field.

Astrophysics