Distances to planetary nebulae. II - H I absorption observations

Details Distances to planetary nebulae. II - H I absorption observations Distances to planetary nebulae. II - H I absorption observations

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157..191g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 1, March 1986, p. 191-203. ZWO-supported research.

Astronomy and Astrophysics

Astronomy

57

Absorption Spectra, Emission Spectra, Galactic Structure, Planetary Nebulae, Radio Telescopes, Distance, H Ii Regions, Radial Velocity, Radio Astronomy

Scientific paper

Measurements of 21-cm absorption spectra for 24 PN have been carried out, together with the 21-cm absorption spectrum of a background source in each case. The 21-cm emission spectra in the direction towards the PN have also been measured. Kinematic distances to the PN are either derived using a flat galactic rotation curve or using distances and radial velocities of H II regions to determine the galactic structure. For 12 planetary nebulae, the final distance derived has an uncertainty of less than 50 percent, a significant improvement over previous distance determinations. H I, which is thought to be associated with the PN, was found only in the absorption spectrum of NGC 6790. A rough estimate of the lower limit to the total mass of the H I involved gives 0.01 solar mass.

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