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Identification of three new protoplanetary nebulae exhibiting the unidentified feature at 21 μm

Published online by Cambridge University Press:  30 August 2012

Luciano Cerrigone ,
Joseph L. Hora ,
Grazia Umana ,
Corrado Trigilio ,
Alexa Hart  and
Giovanni Fazio
Luciano Cerrigone
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69, 53121, Bonn, Germany email: [email protected]
Joseph L. Hora
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden St, 02138 Cambridge, MA, USA
Grazia Umana
Affiliation:
INAF, Osservatorio Astrofisico di Catania via S. Sofia 58, 95123 Catania, Italy
Corrado Trigilio
Affiliation:
INAF, Osservatorio Astrofisico di Catania via S. Sofia 58, 95123 Catania, Italy
Alexa Hart
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden St, 02138 Cambridge, MA, USA
Giovanni Fazio
Affiliation:
Harvard-Smithsonian Center for Astrophysics 60 Garden St, 02138 Cambridge, MA, USA
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Abstract

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Since its discovery, the feature at 21 μm has been detected in all C-rich proto-PNe of intermediate spectral type (A–G) and – weakly – in a few PNe and AGB stars, but the nature of its carriers remains unknown. In this paper, we show the detection of this feature in the spectra of three new stars obtained with the Spitzer Space Telescope. In the attempt to relate the unidentified feature to other dust features, we retrieved mid-IR spectra of all the 21 μm sources currently known from ISO and Spitzer archives and noticed a correlation between the flux emitted in the 21 μm feature and that emitted at 7 and 11 μm (PAH bands and HAC broad emission). Such a correlation may point to a common nature of the carriers.

Keywords

Stars: AGB and post-AGBcircumstellar matterinfrared: 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. 328 - 329
Copyright
Copyright © International Astronomical Union 2012

References

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