Processing of polycyclic aromatic hydrocarbons in evolved planetary nebulae

被引：0

作者：

Ohsawa, Ryou ^{[1
]}

Onaka, Takashi ^{[1
]}

Sakon, Itsuki ^{[1
]}

Yamamura, Issei ^{[2
]}

Matsuura, Mikako ^{[3
]}

Kaneda, Hidehiro ^{[4
]}

机构：

[1] Univ Tokyo, Dept Astron, Sch Sci, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[2] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

[3] UCL, Dept Phys & Astron, London WC1E 6BT, England

[4] Nagoya Univ, Grad Sch Sci, Chikusa Ku, Nagoya, Aichi 4648602, Japan

来源：

PLANETARY NEBULAE: AN EYE TO THE FUTURE | 2012年 / 283期

关键词：

planetary nebulae: general; infrared: ISM; molecular processes; PAHS;

D O I：

10.1017/S1743921312011933

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 mu m) and Spitzer (5-14 mu m) 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 mu m bands is enhanced. The enhancement might indicate some chemical processing, such as hydrogenation, on small PAHs.

引用

页码：462 / +

页数：2

共 4 条

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