INFRARED FLUX EXCESSES FROM HOT SUBDWARFS - II - 72 MORE OBJECTS

In our search, started in February, 1994, for JHK excess fluxes among the hot subdwarf population as an indicator for the presence of binary companions, results for 72 more hot objects (=63 hot subdwarfs + 1 Ho rizontal Branch B star + 7 white dwarfs + 1 non-subdwarf object) obser ved with the Carlos Sanchez CVF IR photometer tin June and October. 19 94) are presented. The exact number of binary hot subdwarfs has gained renewed importance after the recent discovery of pulsators with G-F c ompanions. The total number of candidates we propose may help to set s ome constraints; for example, out of 41 objects with excesses, 13 may have (G-type binary companions. From our new sample, 14 discoveries of binary candidates have been found: BD+25 4655; Feige 108. HD 4539, HD 149382, HD 216135, KPD 2109+440, LSI+63 198. LSIV + 10 9, LSV + 22 38 , PG 0011 + 221, PG 0116+242; PG 0314+103, PG 2151+100 and TON 139. Be sides, 2 more from reanalysis of February, 1994, data BD+37 1977 and B D+48 1777, may now be found to be IR excess candidates. Two suspected binaries, PB 8555 and SB 7, are also confirmed. By fitting Kurucz (199 3) model spectra and assuming zero-age main sequence companions, we fi nd upper limits on the subdwarf gravities. The distributions of upper limits on log(g), mostly between about 5.25 and 6.5. are nearly identi cal for both sdBs and sdOs.