  There is growing evidence that some Be stars were spun up through mass
transfer in a close binary system, leaving the former mass donor star as a hot,
stripped-down object. There are five known cases of Be stars with hot subdwarf
(sdO) companions that were discovered through International Ultraviolet
Explorer (IUE) spectroscopy. Here we expand the search for Be+sdO candidates
using archival FUV spectra from IUE. We collected IUE spectra for 264 stars and
formed cross-correlation functions (CCFs) with a model spectrum for a hot
subdwarf. Twelve new candidate Be+sdO systems were found, and eight of these
display radial velocity variations associated with orbital motion. The new plus
known Be+sdO systems have Be stars with spectral subtypes of B0 to B3, and the
lack of later-type systems is surprising given the large number of cooler
B-stars in our sample. We discuss explanations for the observed number and
spectral type distribution of the Be+sdO systems, and we argue that there are
probably many Be systems with stripped companions that are too faint for
detection through our analysis.
