Issue |
Astron. Astrophys. Suppl. Ser.
Volume 132, Number 1, October I 1998
|
|
---|---|---|
Page(s) | 13 - 20 | |
DOI | https://doi.org/10.1051/aas:1998356 | |
Published online | 15 October 1998 |
The kinematics of 867 galactic planetary nebulae*
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
Send offprint request to: S. Durand
Received:
18
April
1997
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
© European Southern Observatory (ESO), 1998