Sequence structure emission in The Red Rectangle Bands

Details Sequence structure emission in The Red Rectangle Bands Sequence structure emission in The Red Rectangle Bands

2005-10-28

arxiv.org/abs/astro-ph/0510790v1

Astrophys.J.639:194-203,2006

Astronomy and Astrophysics

Astrophysics

13 pages, 9 figures, accepted for publication in ApJ. A version of the paper with full resolution figures is available at: h

Scientific paper

10.1086/499260

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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