Morpho-kinematic properties of Wolf-Rayet planetary nebulae
  The majority of planetary nebulae (PNe) show axisymmetric morphologies, whose
causes are not well understood. In this work, we present spatially resolved
kinematic observations of 14 Galactic PNe surrounding Wolf-Rayet ([WR]) and
weak emission-line stars ($wels$) based on the H$\alpha$ and [N II] emission
taken with the Wide Field Spectrograph on the ANU 2.3-m telescope.
Velocity-resolved channel maps and position--velocity diagrams, together with
archival Hubble Space Telescope ($HST$) and ground-based images, are employed
to construct three-dimensional morpho-kinematic models of 12 objects using the
program SHAPE. Our results indicate that these 12 PNe mostly have elliptical
morphologies with either open or closed outer ends. Interior shell orientations
in NGC6578 and NGC6629 kinematic maps, as well as the compact ($\leq 6$ arcsec)
PNe Pe1-1, M3-15, M1-25, Hen2-142, and NGC6567, are consistent with the
elliptically symmetric morphologies seen in high-resolution $HST$ images.
Point-symmetric knots in Hb4 exhibit deceleration with distance from the
central star that could be due to shock collisions with the ambient medium.
Velocity dispersion maps of Pe1-1 also disclose the shock interaction between
its collimated outflows and the interstellar medium. Collimated bipolar
outflows are also visible in the position--velocity diagrams of M3-30, M1-32,
and M3-15, which are reconstructed by tenuous prolate ellipsoids extending
upwardly from dense equatorial regions in the kinematic models. The formation
of aspherical morphologies and collimated outflows in these PNe could be
related to the stellar evolution of hydrogen-deficient [WR] and $wels$ nuclei
that requires further investigation.
