Chemical composition of gaseous nebula NGC 6302.
The irregular emission nebula NGC 6302 exhibits a rich spectrum of lines ranging in excitation from [NI] to [FeVII]. An assessment of available spectroscopic data, covering a large intensity range, indicates excess of helium and nitrogen as compared with average planetary nebulae, but deficiencies in iron and calcium. These metals are presumably tied up in solid grains, as suggested by Shields for iron in NGC 7027.
Aller
L H
LH
Department of Astronomy, University of California, Los Angeles, California 90024.
Czyzak
S J
SJ