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Ionization Models of Planetary Nebulae

Published online by Cambridge University Press:  22 September 2016

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
Copyright
Copyright © Reidel 1978 

References

Bohlin, R.C., Harrington, J.P., and Stecher, T.P.: 1977, “The Rocket-Ultraviolet Spectrum and Models of the Planetary Nebula NGC 7662”, Astrophys. J. (in press).CrossRefGoogle Scholar
Bohlin, R.C., Marionni, P.A., and Stecher, T.P.: 1975, Astrophys. J. 202, 415.Google Scholar
Buerger, E.: 1973, Astrophys. J. 180, 817.Google Scholar
Capriotti, E.R., Cromwell, R.H., and Williams, R.E.: 1971, Astrophys. Letters 7, 241.Google Scholar
Christensen, R.B., Watson, W.D., and Blint, R.J.: 1977, Astrophys. J. 213, 712.Google Scholar
Flower, D.R.: 1968, Astrophys. Letters 2, 205.Google Scholar
Flower, D.R.: 1969a, Monthly Notices Roy. Astron. Soc. 146, 171.CrossRefGoogle Scholar
Flower, D.R.: 1969b, Monthly Notices Roy. Astron. Soc. 146, 243.Google Scholar
Goodson, W.L.: 1967, Z. Astrophys. 66, 118.Google Scholar
Harrington, J.P.: 1968, Astrophys. J. 152, 943.Google Scholar
Harrington, J.P.: 1969, Astrophys. J. 156, 903.Google Scholar
Harrington, J.P.: 1977, Monthly Notices Roy. Astron. Soc. 179, 63.CrossRefGoogle Scholar
Harrington, J.P., and Marionni, P.A.: 1976, Astrophys. J. 206, 458.Google Scholar
Hummer, D.G. and Mihalas, D.: 1970, Monthly Notices Roy. Astron. Soc. 147, 339.CrossRefGoogle Scholar
Hummer, D.G. and Seaton, M.J.: 1964, Monthly Notices Roy. Astron. Soc. 127, 217.Google Scholar
Hummer, D.G. and Seaton, M.J.: 1973, Mem. Soc. Roy. Sci. Liege, 6e Serie 5, 225.Google Scholar
Kaler, J.B.: 1976, Astrophys. J. 210, 843.CrossRefGoogle Scholar
Kirkpatrick, R.C.: 1970, Astrophys. J. 162, 33.CrossRefGoogle Scholar
Kirkpatrick, R.C.: 1972, Astrophys. J. 176, 381.Google Scholar
Mathis, J.E.: 1976, Astrophys. J. 207, 442.Google Scholar
Shields, G.A.: 1975, Astrophys. J. 195, 475.Google Scholar
Shields, G.A.: 1977, “Ionization Structure and Composition of the Planetary Nebula NGC 7027”, preprint.Google Scholar
Stromgren, B.: 1939, Astrophys. J. 89, 526.Google Scholar
Webster, B.L.: 1976, Monthly Notices Roy. Astron. Soc. 174, 157.Google Scholar
Williams, R.E.: 1968, I.A.U. Symposium No. 34 “Planetary Nebulae”, ed. Osterbrock, D.E. and O'Dell, C.R. (D. Reidel; Dordrecht, Holland), 190.Google Scholar
Williams, R.E. 1973, Monthly Notices Roy. Astron. Soc. 164, 111.Google Scholar