Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.303..446k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 3, pp. 446-454.
Astronomy and Astrophysics
Astronomy
26
Stars: Individual: Red Rectangle, Ism: Abundances, Ism: Molecules, Infrared: Ism: Lines And Bands
Scientific paper
The biconical Red Rectangle nebula exhibits very strong unidentified infrared (UIR) emission bands, a subset of the optical diffuse interstellar bands (in emission) and extended red emission (ERE). A key question is the extent to which the carriers of these spectroscopic signatures may be related. In a new study of the 3.3-μm emission, CGS 4 spectra were recorded at UKIRT, which give information on the spatial distribution of the 3.3-μm carrier in the nebula and on the width, peak wavelength and profile of the feature as a function of offset from the central star, HD 44179. Both Type 1 (lambda_0~ 3.289 mum, full width at half-maximum FWHM ~ 0.042 mu m) and Type 2 (lambda_0~ 3.296 mum, FWHM ~ 0.020 μm) 3.3-μm features, as defined by Tokunaga et al., are found within the nebula. Type 2 is seen predominantly towards the central star, at the bicone interfaces and east and west of the star in the nebula. The broader Type 1 feature appears in the nebula 5 arcsec south of the central star, whereas the 3.3-μm band at 5 arcsec north appears to be a blend of Type 1 and Type 2. We find that there is no significant correlation between the intensity of the 3.3-μm feature and that of either the unidentified optical (diffuse) emission bands or ERE. This result suggests that there is at most an indirect link between the carrier(s) of the 3.3-μm band and this subset of diffuse bands. Such a link could arise, for example, if these diffuse band carriers were formed by chemical erosion or photodissociation of polycyclic aromatic hydrocarbon material.
Hurst M. E.
Kerr Thomas H.
Miles Janet R.
Sarre Peter J.
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