| タイトル | The mid-infrared spectrum of the carbon star HD 38218 and its possible relation to polycyclic aromatic hydrocarbons |
| 著者（英） | Snow, Theodore P.; Tielens, A. G. G. M.; Buss, Richard H., Jr. |
| 著者所属（英） | Colorado Univ.|NASA Ames Research Center |
| 発行日 | 1991-05-01 |
| 言語 | eng |
| 内容記述 | The mid-infrared spectra of carbon giant stars with hot companions are investigated in order to search for infrared emission bands from polycyclic aromatic hydrocarbons (PAH) in the envelopes of the C giants. A strong 8-micron emission band found in TU Tau = HD 38218 is attributed to the binary A star companion. It is argued that if the 8-micron feature in HD 38218 arises from PAHs, they seem to be important constituents of the C-giant shell, and they might be large compared with some interstellar PAHs. It is suggested that because no other IR spectra of C giants show clear PAH features, the greater flux of hard radiation in the binary HD 38218 seems likely to be responsible for the 8-micron feature and for its absence in many other C giants. Thus, PAHs could be present in the same amounts relative to SiC grains in the shells of similar single C giants, and the formation of carbonaceous grains could proceed through the formation of PAHs in C giant shells. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 91A34727 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/348627 |
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