Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011yera.confe..16g&link_type=abstract
The 41st Young European Radio Astronomers Conference, held at University of Manchester/Jodrell Bank Observatory, 18-20 July 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The methods that use statistical techniques to measure the distance to planetary nebulae (PNe) can provide accuracies as good as 50% on average, but when they are applied to individual objects the errors can be as large as a factor of 2 or even more. This derives a very uncertain estimation of the galactic location and physical parameters of PNe.
One technique that has proven effective is the so-called expansion parallax method, which is based on the comparison of the angular expansion of the source on the plane of the sky, with the velocity expansion along the line of sight measured from the width of some appropriately chosen spectral lines. In principle, the angular expansion could be measured using any tracer, but the free-free radio emission from the ionised gas has been, by far, the most popular choice. I will present the results of applying this technique to the PNe M2-43, IC 418 and NGC 6881.
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