  We have observed the Herbig Ae/Be sources AB Aur, VV Ser, V1685 Cyg (BD+40
4124), AS 442, and MWC 1080 with the Palomar Testbed Interferometer, obtaining
the longest baseline near-IR interferometric observations of this class of
objects. All of the sources are resolved at 2.2 microns with angular size
scales generally <5 mas, consistent with the only previous near-IR
interferometric measurements of Herbig Ae/Be stars by Millan-Gabet and
collaborators. We determine the angular size scales and orientations predicted
by uniform disk, Gaussian, ring, and accretion disk models. Although it is
difficult to distinguish different radial distributions, we are able to place
firm constraints on the inclinations of these models, and our measurements are
the first that show evidence for significantly inclined morphologies. In
addition, the derived angular sizes for the early type Herbig Be stars in our
sample, V1685 Cyg and MWC 1080, agree reasonably well with those predicted by
the face-on accretion disk models used by Hillenbrand and collaborators to
explain observed spectral energy distributions. In contrast, our data for the
later-type sources AB Aur, VV Ser, and AS 442 are somewhat inconsistent with
these models, and may be explained better through the puffed-up inner disk
models of Dullemond and collaborators.
