KINEMATICS OF BIPOLAR PLANETARY-NEBULAE

We present narrow band images and long axis spectra of the bipolar pla netary nebulae (PNe) CTS 1, He 2-84, He 2-123, IC 4406, K 3-72, M 1-16 , Na 2, and We 1-4. CTS 1, previously described as a compact PN, is an extended elongated nebula. It presents relatively high expansion velo cities (40 km s- 1) in its inner region and a pair of low velocity lob es ending in polar condensations. He 2-84 shows high velocity features (DELTAV(rad) = 125 km s- 1) in newly discovered faint outer extension s of the bipolar lobes. M1-16 (Schwarz 1992) has been reobserved and t he shock features confirmed. The other PNe present low-velocity patter ns which could be partially due to projection effects. The systemic ve locities of the nebulae are computed, and the electron densities deriv ed from the [SII]lambdalambda671.7,673.1 doublet ratio. In addition, w e discuss the detection and the expected versus measured intensities o f the HeIIlambda656.0 line which, due to its vicinity to Halpha, can b e sometimes confused with high velocity components of the hydrogen lin e. Some preliminary statistical considerations on the high velocity ch aracter of the class of bipolar planetary nebulae are also presented.