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S II emission lines in Planetary Nebulae

Published online by Cambridge University Press:  25 May 2016

F.C. McKenna ,
F. P. Keenan ,
L. H. Aller ,
S. Hyung ,
K. L. Bell  and
C. A. Ramsbottom
F.C. McKenna
Affiliation:
1Dept of Pure and Applied Physics, The Queen's University of Belfast
F. P. Keenan
Affiliation:
1Dept of Pure and Applied Physics, The Queen's University of Belfast
L. H. Aller
Affiliation:
2Physics and Astronomy Department, University of California, Los Angeles
S. Hyung
Affiliation:
2Physics and Astronomy Department, University of California, Los Angeles
K. L. Bell
Affiliation:
3Dept of Applied Mathematics and Theoretical Physics, The Queen's University of Belfast
C. A. Ramsbottom
Affiliation:
3Dept of Applied Mathematics and Theoretical Physics, The Queen's University of Belfast

Extract

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Emission lines arising from transitions in S II have been detected in a wide variety of astronomical sources, including planetary nebulae (Hyung, Keyes & Aller 1995). These transitions are used to derive information on emitting plasmas parameters (Te , Ne ) through diagnostic line ratios, although to calculate these quantities reliably, accurate atomic data must be employed, especially for electron impact excitation rates.

Type
IV. Envelopes
Information
Symposium - International Astronomical Union , Volume 180: Planetary Nebulae , 1997 , pp. 258
Copyright
Copyright © Kluwer 1997 

References

Cai, W., Pradhan, A.K., 1993, ApJS, 88, 329.Google Scholar
Hyung, S., 1994, ApJS, 90, 119.CrossRefGoogle Scholar
Hyung, S., Keyes, C.D., Aller, L.H., 1995, MNRAS, 272, 49.Google Scholar
Keenan, F.P., Aller, L.H., Bell, K.L., McKenna, F.C., and Ramsbottom, C.A. 1996, MNRAS, 281, 1073.CrossRefGoogle Scholar
Keyes, C.D., Aller, L.H., Feibelman, W.A., 1990, PASP, 102, 59.CrossRefGoogle Scholar