The 3.3 $μ$m PAH emission band of the Red Rectangle
arXiv:0707.0541 · doi:10.1111/j.1365-2966.2007.12197.x
Abstract
A new analysis of long-slit CGS4 (UKIRT) spectra of the 3.3 $μ$m feature of the Red Rectangle and its evolution with offset along the NW whisker of the nebula is presented. The results support a proposed two-component interpretation for the 3.3 $μ$m feature with peak wavelengths near 3.28 $μ$m and 3.30 $μ$m. Both components exhibit a small shift to shorter wavelength with increasing offset from the central star which, by comparison with laboratory studies, is consistent with a decrease in temperature of the carriers with distance from HD 44179. The two-component approach is also applied to 3.3 $μ$m data for the Red Rectangle, Orion Bar D2 and Orion Bar H2S1 from ISO SWS studies.
8 pages, 12 figures, MNRAS accepted