Hostname: page-component-5c6d5d7d68-wtssw Total loading time: 0 Render date: 2024-08-29T13:28:33.949Z Has data issue: false hasContentIssue false
  • English
  • Français

Hydrogen Deficient Planetary Nebulae: Preliminary Results

Published online by Cambridge University Press:  12 April 2016

S.R. Pottasch ,
A. Mampaso ,
A. Manchado  and
J. Menzies
S.R. Pottasch
Affiliation:
University of Groningen
A. Mampaso
Affiliation:
Instituto de Astrofisica de Canarias
A. Manchado
Affiliation:
Instituto de Astrofisica de Canarias
J. Menzies
Affiliation:
South African Astronomical Observatory

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

New spectra of A78 and A58 at different positions in the nebulae are presented. An abundance gradient is found in A78, extending quite close to the center. Similarly the nebulous knot near the center of A58 has considerably higher heavy element abundances than the outer regions of this nebula. The ionization state is considerably lower in A58 than A78. In A78 most of the neon is in the form of Ne+3 and Ne+4, indicating that the standard ionization correction factor as used by Jacoby and Ford, is substantially in error. Finally, the very high infrared excesses found in this nebulae are discussed.

Type
VII Related Objects
Information
International Astronomical Union Colloquium , Volume 87: Hydrogen Deficient Stars and Related Objects , 1985 , pp. 359 - 365
Copyright
Copyright © Reidel 1986

References

Abell, G.O. 1966, Astrophys. J. 144, 259 Google Scholar
Cohen, N., Barlow, M.J. 1974, Astrophys. J. 193, 401 Google Scholar
Hazard, C. Terlevich, R., Morton, D.C., Sargent, W.L.W., Ferland, G. 1980, Nature 285, 463 CrossRefGoogle Scholar
Jacoby, G.H. 1979, Publ. Astron. Soc. Pac. 91, 754 CrossRefGoogle Scholar
Jacoby, G.H., Ford, H.C. 1983, Astrophys. J. 266, 298 CrossRefGoogle Scholar
Lundmark, K. 1921, Publ. Astron, Soc. Pac. 33, 314 Google Scholar
Pottasch, S.R., Baud, B., Beintema, D., Emerson, J., Habing, H.J., Harris, S., Hauck, J., Jennings, R., Marsden, P. 1984, Astron. astrophys. 138, 10 Google Scholar
Seiter, W.C. 1985, Mitleitungen Astron. Ges. 63, 181 and 187.Google Scholar