Open AccessImaging and Spectroscopy of the Helix Nebula: The Ring Is Actually a Disk
Author(s) -
C. R. O’dell
Publication year - 1998
Publication title -
the astronomical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.61
H-Index - 271
eISSN - 1538-3881
pISSN - 0004-6256
DOI - 10.1086/300506
Subject(s) - physics , nebula , photoionization , planetary nebula , astrophysics , ionization , doubly ionized oxygen , spectroscopy , emission nebula , line (geometry) , electron density , electron temperature , emission spectrum , ion , electron , spectral line , astronomy , stars , geometry , mathematics , quantum mechanics
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