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Spitzer IRS spectra of compact Galactic planetary nebulae: The link between dust, evolution, and metallicity

Published online by Cambridge University Press:  30 August 2012

L. Stanghellini ,
D. A. García-Hernández ,
P. García-Lario ,
J. E. Davies ,
R. A. Shaw ,
E. Villaver ,
A. Manchado  and
J. V. Perea-Calderón
L. Stanghellini
Affiliation:
National Optical Astronomy Observatory Tucson, AZ 85719, USA
D. A. García-Hernández
Affiliation:
Instituto de Astrofísica de Canarias, vía Láctea s/n, La Laguna, E-38200 Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38201 Tenerife, Spain
P. García-Lario
Affiliation:
Herschel Science Centre, European Space Astronomy Centre, E-28080 Madrid, Spain
J. E. Davies
Affiliation:
Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA
R. A. Shaw
Affiliation:
National Optical Astronomy Observatory Tucson, AZ 85719, USA
E. Villaver
Affiliation:
Departamento de Física Teórica C-XI, Univ. Autónoma de Madrid, E-28049 Madrid, Spain
A. Manchado
Affiliation:
Instituto de Astrofísica de Canarias, vía Láctea s/n, La Laguna, E-38200 Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, E-38201 Tenerife, Spain Consejo Superior de Investigaciones Cientficas, E-28006 Madrid, Spain
J. V. Perea-Calderón
Affiliation:
European Space Astronomy Centre, INSA S. A., E28080, Madrid, Spain
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Abstract

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A sample of ~150 compact Galactic PNe has been observed with the Spitzer/IRS spectrograph to characterize their dust properties. These PNe are likely to be at the onset of the PN evolutionary phase, and are therefore ideal for probing dust evolution. The molecular emission features in these Galactic PN spectra are similar to those found in our Magellanic Cloud sample, except that we found a sizable fraction of PNe with mixed-chemistry dust which are not observed in the Clouds. We also found that the distribution among dust types depends strongly on the metallicity of the parent population, implying that the metallicity of the progenitors affects the evolution of a PN from its early stages.

Keywords

Planetary nebulae: generaldustinfrared: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 29 - 32
Copyright
Copyright © International Astronomical Union 2012

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