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Spectral analysis of mid-IR excesses of central stars of planetary nebulae

Published online by Cambridge University Press:  30 August 2012

Jana Bilikova ,
You-Hua Chu ,
Kate Y.L. Su  and
Robert Gruendl
Jana Bilikova
Affiliation:
Dept. of Astronomy, University of Illinois, 1002 West Green Street, Urbana, Illinois, 61801, USA email: jbiliko2@illinois.edu
You-Hua Chu
Affiliation:
Dept. of Astronomy, University of Illinois, 1002 West Green Street, Urbana, Illinois, 61801, USA email: jbiliko2@illinois.edu
Kate Y.L. Su
Affiliation:
Stewart Observatory, University of Arizona, Tucson, AZ 85721, USA email: ksu@as.arizona.edu
Robert Gruendl
Affiliation:
Dept. of Astronomy, University of Illinois, 1002 West Green Street, Urbana, Illinois, 61801, USA email: jbiliko2@illinois.edu
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Abstract

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In our Spitzer 24 μm survey of hot white dwarfs (WDs) we found 9 WDs with IR excesses, 7 of them are still central stars of planetary nebulae (CSPNs). We have thus carried out a Spitzer archival survey of CSPNs, and found additional objects with IR excesses. To date, a total of 13 CSPNs show IR excesses from Spitzer observations. These mid-IR excesses are indicative of the presence of circumstellar dust, which could be produced by collisions or disruption of sub-planetary objects. To further assess the nature of these IR excesses, we have obtained Spitzer IRS, Gemini NIRI and Michelle, and KPNO 4m echelle spectra of these objects. In this poster, we summarize the spectroscopic observations and discuss the nature of these IR excesses.

Keywords

planetary nebulae: generalinfrared: starscircumstellar matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 310 - 311
Copyright
Copyright © International Astronomical Union 2012

References

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