Open AccessThe optical spectrum of NGC 7009 - II. A high-excitation bright ring region on the minor axis
Author(s) -
Siek Hyung,
L. H. Aller
Publication year - 1995
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-8711
pISSN - 0035-8711
DOI - 10.1093/mnras/273.4.973
Subject(s) - physics , astrophysics , excitation , knot (papermaking) , planetary nebula , ring (chemistry) , nebula , stars , chemistry , organic chemistry , quantum mechanics , chemical engineering , engineering
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