Molecular hydrogen ion (H2+) absorption in planetary nebulae.
DOI: 10.1086/112961
Bibcode: 1981AJ.....86..881F
Feibelman, W. A.; Hobbs, R. W.; Boggess, A.; McCracken, C. W.
United States
Abstract
Several IUE spectra of planetary nebulae show an absorption feature shortward of 1500 A which is believed to be due to H2(+). The nebulae are excited by stars of spectral type O3-O7 or continuum, and all but one have double-shell structure.
1981
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The Astronomical Journal
IUE
5