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The Shocking Truth About some “Proto-PN”
Published online by Cambridge University Press: 19 July 2016
Abstract
A small number of bipolar planetaries -including M2-9, M1-91, GL 618, and M2-56- exhibit very strong emission lines of low ionization species such as [O I], [N I], [N II], and [S II]. Most previous authors have attempted to analyze the spectra of these objects assuming that they are photoionized by their central stars. Closer examination, however, suggests that a different excitation mechanism may be at work -that of shock heating.
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- V. Origin of Planetaries
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- Copyright © Kluwer 1989
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