MILLIMETER AND RADIO INTERFEROMETRY OF HERBIG AE BE STARS/

Nine Herbig Ae/Be stars have been observed at lambda = 2.7 mm with the IRAM and BIMA interferometers in order to place constraints on the pr esence of disk material around these objects. Only one Herbig Ae/Be st ar, Elias 3-1, was detected with certainty; two additional stars, MWC 137 and V645 Cyg, were possibly detected. The remaining six Herbig Ae/ Be stars were not detected. Two deeply embedded objects near the targe t stars, LkH alpha 198-MM and V1318 Cyg S, were also detected. The emi ssion from Elias 3-1 and V1318 Cyg S is unresolved, while that from Lk H alpha 198 MM is resolved. Two stars (Elias 3-1 and V645 Cyg) were ob served with the VLA at lambda = 7 mm, 1.3 cm, and 3.6 cm. Based on our VLA data and those of Skinner, Brown, & Stewart, it appears that emis sion from ionized gas may contribute substantially to the millimeter e mission from several sources. After correcting for this component wher e necessary, the remaining emission from most of the sample, attribute d to dust, is considerably less than that predicted by assuming that t he shorter wavelength emission arises in a disk. Much of the submillim eter and millimeter emission toward most of these stars must therefore arise in an extended envelope. For Elias 3-1, the data are consistent with a disk with mass around 0.1 M.. We place limits on the masses of disks around the other stars.