APERTURE SYNTHESIS IMAGING OF V892 Tau AND PV Cep: DISK EVOLUTION

I present a study of two Herbig Ae stars that are in completely different evolutionary stages: V892 Tau and PV Cep. Using sub-arcsecond interferometric observations obtained with the Combined Array for Research in Millimeter-wave Astronomy at lambda = 1.3 and 2.7 mm, I have for the first time resolved their disks. I deduce that the 5 Myr old V892 Tau has a low dust opacity index beta = 1.1 and a disk mass of similar to 0.03 M(circle dot). These values correspond to the growth of its dust into large, up to centimeters size, structures. In contrast, the very young (a few x 10(5) yr) PV Cep has a quite high opacity index beta = 1.75 and a more massive disk 0.8 M(circle dot). PV Cep has the youngest resolved disk around any Herbig Ae star. Unlike the youngest T Tauri and Class 0 stars, which contain large and processed grains, the young Herbig Ae star, PV Cep, disk contains interstellar-medium-like unprocessed dust. This suggests that PV Cep's dust evolution is slower than T Tauri stars'. I also present high spatial resolution interferometric observations of the PV Cep outflow. The outflow inclination is consistent with the orientation of the known Herbig-Haro flow in that region, HH315.