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Processing of polycyclic aromatic hydrocarbons in evolved planetary nebulae

Published online by Cambridge University Press:  30 August 2012

Ryou Ohsawa ,
Takashi Onaka ,
Itsuki Sakon ,
Issei Yamamura ,
Mikako Matsuura  and
Hidehiro Kaneda
Ryou Ohsawa
Affiliation:
Department of Astronomy, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: ohsawa@astron.s.u-tokyo.ac.jp
Takashi Onaka
Affiliation:
Department of Astronomy, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: ohsawa@astron.s.u-tokyo.ac.jp
Itsuki Sakon
Affiliation:
Department of Astronomy, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan email: ohsawa@astron.s.u-tokyo.ac.jp
Issei Yamamura
Affiliation:
Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan
Mikako Matsuura
Affiliation:
Dept. of Physics & Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
Hidehiro Kaneda
Affiliation:
Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
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Abstract

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We investigate the infrared emission bands from Polycyclic Aromatic Hydrocarbons (PAHs) in Galactic planetary nebulae (PNe). PAHs in PNe are assumed to be in transition from circumstellar to interstellar PAHs. We select 15 evolved PNe taking account of effective stellar temperatures and obtain infrared spectra of PNe from AKARI (2.5–5 μm) and Spitzer (5–14 μm) observations. Their evolutionary phase is estimated using [SIV]10.51/[NeII]12.81. We find that the near-infrared PAH bands are significantly enhanced along with stellar evolution sequence. We also find that the ratio of 3.4 to 3.3 μm bands is enhanced. The enhancement might indicate some chemical processing, such as hydrogenation, on small PAHs.

Keywords

planetary nebulae: generalinfrared: ISMmolecular processes
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 462 - 463
Copyright
Copyright © International Astronomical Union 2012

References

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