The 3.3 $\mu$m PAH emission band of the Red Rectangle

Abstract

A new analysis of long-slit CGS4 (UKIRT) spectra of the 3.3 $\mu$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 $\mu$m feature with peak wavelengths near 3.28 $\mu$m and 3.30 $\mu$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 $\mu$m data for the Red Rectangle, Orion Bar D2 and Orion Bar H2S1 from ISO SWS studies.

arXiv comment8 pages, 12 figures, MNRAS accepted

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• The 3.3 $\mu$m Infrared Emission Feature: Observational and Laboratory Constraints on Its Carrier
• PDRs4All XVI. Tracing aromatic infrared band characteristics in photodissociation region spectra with PAHFIT in the JWST era
• On the polarisation of the Red Rectangle optical emission bands
• Searching for Corannulene with ALMA: Observations of the Red Rectangle Nebula
• JWST MIRI-MRS observations of the Red Rectangle: AIB class transformation in the outer nebula