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Ionization Models of Planetary Nebulae

Published online by Cambridge University Press:  22 September 2016

J. Patrick Harrington
J. Patrick Harrington*
Affiliation:
Astronomy Program, University of Maryland, College Park, USA

Extract

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Our knowledge of the ionization structure of gaseous nebulae may be dated from the classic paper of Strömgren (1939), who showed that the transition between ionized and neutral hydrogen is sharp. In fact the very sharpness of the transition region has at last become a difficulty. Another milestone was the paper of Hummer and Seaton (1964) which clarified the structure of nebulae containing helium as well as hydrogen. Then, just a decade ago, the first models of planetary nebulae were constructed which detailed the changes in the temperature and in the ionization of the heavy elements as the stellar radiation was progressively diminished by absorption in the nebular gas (Goodson, 1967 Harrington, 1968; Williams, 1968; Flower, 1969a). These first models were of a general nature, but soon models were constructed to match specific nebulae (Flower, 1968, 1969b; Harrington, 1969; Kirkpatrick, 1970).

Type
Session III: Physical Processes
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 151 - 157
Copyright
Copyright © Reidel 1978 

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