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The Galactic Disk Distribution of Dust Emission Features in Planetary Nebulae

Published online by Cambridge University Press:  25 May 2016

S. Casassus  and
P.F. Roche
S. Casassus
Affiliation:
Astrophysics, Oxford University, Keble Road, Oxford OX1 3RH, UK
P.F. Roche
Affiliation:
Astrophysics, Oxford University, Keble Road, Oxford OX1 3RH, UK

Abstract

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The properties of the carbon and oxygen chemical balance in planetary nebulae (PNe) are analysed through mid infrared spectroscopy of warm dust emission features in a sample of 72 objects. The adoption of a statistical distance scale shows that the galactic disk distribution of warm dust types in PNe is rather homogeneous with height over the galactic plane, and that there is a trend for the proportion of PNe with O rich dust signatures to decrease with galactocentric radius. Models of the galactic distribution of PNe compositions require a minimum progenitor mass of 1.2M⊙, although the observational constraints suffer from the smallness of the sample. This initial investigation is however an incentive to pursue the use of warm dust emission in PNe to study their progenitor population in various galactic environments.

Type
Part 6. AGB Stars as a Population of Various Galaxies
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 517 - 522
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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