Astron. Astrophys. Suppl. Ser. 132, 13-20

The kinematics of 867 galactic planetary nebulae

S. Durand ¹ - A. Acker ¹ - A. Zijlstra ²

Send offprint request: S. Durand

1 - UMR 7550, Équipe Évolution Galactique, Observatoire de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg, France
2 - UMIST, department of Physics, P.O. Box 88, Manchester M60 1QD, UK

Received April 18, 1997; accepted March 24, 1998

Abstract:

We present a compilation of radial velocities of 867 galactic planetary nebulae. Almost 900 new measurements are included. Previously published kinematical data are compared with the new high-resolution data to assess their accuracies. One of the largest samples in the literature shows evidence for a systematic velocity offset. We calculate weighted averages between all available data. Of the final values in the catalogue, 90$\%$ have accuracies better than 20 km$\,$s^-1. We use this compilation to derive kinematical parameters of the galactic differential rotation obtained from least-square fitting and to establish the Disk rotation curve; we find no significal trend for the presence of an increasing external rotation curve. We examine also the rotation of the bulge; the derived curve is consistent with a linearly increasing rotation velocity with l: we find $V_{\rm b,r}=(9.9\pm1.3)l - (6.7\pm8.5)$ km s^-1. A possible steeper gradient in the innermost region is indicated.

Key words: catalogues -- planetary nebulae -- Galaxy (the): kinematics of