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2003MNRAS.340..883P - Mon. Not. R. Astron. Soc., 340, 883-892 (2003/April-2)
The relation between elemental abundances and morphology in planetary nebulae.
PHILLIPS J.P.
Abstract (from CDS):
We take these trends to imply that circular sources derive from lower-mass progenitors, bipolar sources from higher-mass stars, and that elliptical nebulae derive from all masses of progenitor, high and low.
Whilst such trends are also evident in values of mean abundance <X/H>, they are much less clear. Only in the cases of He/H, N/H, Ne/H and perhaps Ar/H is there evidence for significant abundance differences.
Certain BPNe appear to possess low abundance ratios He/H and Ar/H, and this confirms that a few such outflows may arise from lower-mass progenitors. Similarly, we note that ratios <O/H> are quite modest in elliptical planetary nebulae, and not much different from those for circular and bipolar PNe; a result that conflicts with the expectations of at least one model of shell formation.
Abstract Copyright: 2003 RAS
Journal keyword(s): stars: abundances - planetary nebulae: general
Simbad objects: 75
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