Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..572s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 15, 1987, p. 572-584. Research supported by the Perkin-Elmer Cor
Astronomy and Astrophysics
Astronomy
27
Centimeter Waves, Hydrogen Atoms, Planetary Nebulae, Radio Sources (Astronomy), Astronomical Catalogs, Continuous Spectra, Emission Spectra, Interferometry, Milky Way Galaxy
Scientific paper
The authors searched for neutral atomic hydrogen associated with 22 planetary nebulae and three evolved stars in the 21 cm line at the Arecibo Observatory. Objects whose radial velocities permitted discrimination from Galactic H I were chosen for observation. Hydrogen was detected in absorption from IC 4997. From the measurements new low limits are derived to the mass of atomic hydrogen associated with the undetected nebulae. Radio continuum observations were also made of several of the nebulae at 12.6 cm. The authors reexamine previous measurements of H I in planetary nebulae, and present the data on a consistent footing. The question of planetary nebula distances is considered at length. Finally, implications of the H I measurements for nebular evolution are discussed and it is suggested that atomic hydrogen seen in absorption was expelled from the progenitor star during the final 1000 yr prior to the onset of ionization.
Altschuler Daniel R.
Giovanardi Carlo
Schneider Stephen E.
Silverglate Peter R.
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