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1998ApJ...503..792B - Astrophys. J., 503, 792-797 (1998/August-3)
The structure of cometary knots in the Helix Nebula.
BURKERT A. and O'DELL C.R.
Abstract (from CDS):
Abstract Copyright: ∼
Journal keyword(s): ISM: Structure - ISM: Planetary Nebulae: Individual NGC Number: NGC 7293 - Stars: Mass Loss
Nomenclature: Table 1: [BO98] Helix SSs-MSS N=8
Simbad objects: 8
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