Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...367..967p&link_type=abstract
Astronomy and Astrophysics, v.367, p.967-972 (2001)
Astronomy and Astrophysics
Astrophysics
11
Planetary Nebulae: General, Galaxy: Kinematics And Dynamics
Scientific paper
We have used the observed radial velocities of planetary nebulae, and the galactic rotation curve to define a new distance scale for planetary nebulae. Care has been taken to restrict the analysis to sources in which distance non-linearities are minimised, and for which distortion of the distance scale is likely to be small. We conclude, as a result, that the so-called ``long'' distance scales are the most valid, and that various ``shorter'' scales are unlikely to be correct. The primary systematic errors in this procedure derive from uncertainties in the galactic rotation profile, and in Θ0 and R0. Such errors are less than those normally associated with PN distance determinations.
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