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Sequence structure emission in The Red Rectangle Bands

R. G. Sharp·N. J. Reilly·S. H. Kable·T. W. Schmidt
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Abstract

We report high resolution (R~37,000) integral field spectroscopy of the central region (r<14arcsec) of the Red Rectangle nebula surrounding HD44179. The observations focus on the 5800A emission feature, the bluest of the yellow/red emission bands in the Red Rectangle. We propose that the emission feature, widely believed to be a molecular emission band, is not a molecular rotation contour, but a vibrational contour caused by overlapping sequence bands from a molecule with an extended chromophore. We model the feature as arising in a Polycyclic Aromatic Hydrocarbon (PAH) with 45-100 carbon atoms.

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R. G. Sharp, N. J. Reilly, S. H. Kable, T. W. Schmidt. 2005-10-28. Sequence structure emission in The Red Rectangle Bands. https://doi.org/10.1086/499260

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