SPECTRAL ENERGY-DISTRIBUTION OF PALOMAR-GREEN BL LACERTAE OBJECTS

Optical spectroscopy of three recently discovered BL Lacs (PG 1246+586 , PG 1424+240 and PG 1437+398) in the Palomar-Green optical survey is presented. The three sources have featureless spectra and the continuu m is well represented by a power law model with slopes typical of BL L ac objects. The observations together with data at other frequencies c ollected from the literature, are used to construct the overall energy distribution from radio to X-ray and compared with that of all other BL Lac in the PG survey. The overall properties of the small sample of PG BL Lacs objects are shortly discussed.