HD 30187 B and HD 39927 B: two suspected nearby hot subdwarfs in resolved binaries

In doing a BT, VT photometric solution for close Hipparcos double stars, ba sed on the observations with the Tycho instrument of the Hipparcos satellit e, we discovered; two very blue subluminous components of KD 30187 and HD 3 9927. The position of the components on an observational HR diagram implies their being sdO or sdB hot subdwarfs. The only previously known sdO compon ent of a visual binary, HD 113001 B, is also confirmed by our photometric d ata. The two new candidate hot subdwarfs have parallaxes 8.25 and 10.17 mas , respectively, and with angular separations of about 0.35 arcsec, the orbi tal periods must be of the order of 100 years. This should make it possible to determine their masses from observation.