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Infrared Excess (IRE) as an Indicator of PN Distance

Published online by Cambridge University Press:  07 August 2017

George Jacoby
George Jacoby*
Affiliation:
Kitt Peak National Observatory, National Optical Astronomy Observatories, P.O. Box 26732, Tucson, Arizona 85726, USA

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The VLA observations presented by Pottasch et al. (1988, A&A 205, 248) and Ratag et al. (1990, A&A 233, 181) demonstrate that IRE (Pottasch et al. 1984, A&A 138, 10) correlates very well with F(6 cm) for the Galactic center PN, especially when IRE is large The correlation (see figure) can be approximated by:

Type
III. Highlights on the Nebulae
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 176
Copyright
Copyright © Kluwer 1993