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1987ApJ...322..922B - Astrophys. J., 322, 922-929 (1987/November-0)
The ionization structure of planetary nebulae. VII. New observations of the ring nebula.
BARKER T.
Abstract (from CDS):
Abstract Copyright: ∼
Journal keyword(s): Nebulae: Abundances - Nebulae: Individual Messier Number: M57 - Nebulae: Individual NGC Number: NGC 6720 - Nebulae: Planetary - Ultraviolet: Spectra
Simbad objects: 5
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