Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-07
Astrophys.J.664:1144-1153,2007
Astronomy and Astrophysics
Astrophysics
11 pages (in emulateapj), 5 tables, 7 figures. Accepted for publication in ApJ
Scientific paper
10.1086/519236
We have used the Infrared Spectrograph (IRS) on the Spitzer Space Telescope to obtain spectra of HD 100764, an apparently single carbon star with a circumstellar disk. The spectrum shows emission features from polycyclic aromatic hydrocarbons (PAHs) that are shifted to longer wavelengths than normally seen, as characteristic of ``class C'' systems in the classification scheme of Peeters et al. All seven of the known class C PAH sources are illuminated by radiation fields that are cooler than those which typically excite PAH emission features. The observed wavelength shifts are consistent with hydrocarbon mixtures containing both aromatic and aliphatic bonds. We propose that the class C PAH spectra are distinctive because the carbonaceous material has not been subjected to a strong ultraviolet radiation field, allowing relatively fragile aliphatic materials to survive.
Barry Joseph D.
Bernard-Salas Jeronimo
Bohac C. J.
Duley Walter W.
Forrest William John
No associations
LandOfFree
The unusual hydrocarbon emission from the early carbon star HD 100764: The connection between aromatics and aliphatics does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The unusual hydrocarbon emission from the early carbon star HD 100764: The connection between aromatics and aliphatics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The unusual hydrocarbon emission from the early carbon star HD 100764: The connection between aromatics and aliphatics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-598564