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2007MNRAS.378..231P - Mon. Not. R. Astron. Soc., 378, 231-238 (2007/June-2)
Density gradients in Galactic planetary nebulae.
PHILLIPS J.P.
Abstract (from CDS):
It will be suggested that both of these analyses are unreliable, and should be treated with a considerable degree of caution. A new analysis within the log(F(5GHz)/F(1.4GHz))-log(TB(5GHz)) plane will be used to show that at least 10-20 per cent of PNe are associated with strong density gradients. We shall also show that the ratio F(5GHz)/F(1.4GHz) varies with nebular radius; an evolution that can be interpreted in terms of varying shell masses, and declining electron densities.
Abstract Copyright: 2007 The Author. Journal compilation © 2007 RAS
Journal keyword(s): ISM: jets and outflows - planetary nebulae: general - radio continuum: general
Simbad objects: 24
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