Astron. Astrophys. Suppl. Ser.
Volume 132, Number 1, October I 1998
|Page(s)||13 - 20|
|Published online||15 October 1998|
The kinematics of 867 galactic planetary nebulae*
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
Send offprint request to: S. Durand
Accepted: 24 March 1998
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 km s-1. A possible steeper gradient in the innermost region is indicated.
Key words: catalogues / planetary nebulae / Galaxy (the): kinematics of
Table 2 is available in electronic form only, via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsweb.u-strasbg.fr/Abstract.html
© European Southern Observatory (ESO), 1998