The emission band at 5.25 μm and its relationship to the unidentified emission features at 11-13 and 3.4-3.6 μm.

Details The emission band at 5.25 μm and its relationship to the unidentified emission features at 11-13 and 3.4-3.6 μm. The emission band at 5.25 μm and its relationship to the unidentified emission features at 11-13 and 3.4-3.6 μm.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281l..25r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 281, No. 3, p. L25 - L33

Astronomy and Astrophysics

Astronomy

9

Ism: Abundances -- Dust, Extinction -- Ism: Molecules -- Planetary Nebulae: General -- Infrared: Ism: Lines And Bands, Planetary Nebulae: Infrared Spectra, Planetary Nebulae: Interstellar Molecules

Scientific paper

Spectra at 5-5.6 μm are presented of three planetary nebulae with strong unidentified infrared (UIR) emission bands. All three objects display the 5.25-μm emission band which is attributed to a combination band arising from out-of-plane C-H bending modes. The profiles of the 5.25-μm bands are closely similar to those of the 3.4- and 11.25-μm emission features, confirming that the 5.25-μm feature is a member of the UIR-band family. The origin of this band and its relationship to the UIR bands in the 3.4-3.6 and 11-13 μm spectral regions are discussed. An interpretation of these features in terms of combinations and overtones of the C-H out-of-plane modes is suggested, which, if correct, leads to a simplification of the UIR-band spectrum and suggests that the species that give rise to the bands must have a high degree of symmetry.

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