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M4—18: The Low Excitation PN Around a WC11 Star

Published online by Cambridge University Press:  07 August 2017

R. Surendiranath
Affiliation:
Indian Institute of Astrophysics, Bangalore 560034, India
N. Kameswara Rao
Affiliation:
Indian Institute of Astrophysics, Bangalore 560034, India

Extract

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A photoionization model is presented for M4–18. The model includes the presence of dust mixed with gas. The model shows sulphur and nitrogen are underabundant (relative to solar) and partially succeeds in explaining the observed IR excess.

Type
III. Highlights on the Nebulae
Copyright
Copyright © Kluwer 1993 

References

Goodrich, R.W., and Dahari, O. (1985) Astrophys. J. 289, 342.Google Scholar
Surendiranath, R. (1992) Ph.D. Thesis, Bangalore University.Google Scholar
van der Hucht, et al. (1981) Space Sci. Rev. 28, 227.Google Scholar