Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..282r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Sept. 15, 1991, p. 282-287.
Astronomy and Astrophysics
Astronomy
56
Emission Spectra, Infrared Radiation, Pre-Main Sequence Stars, Stellar Spectra, Aromatic Compounds, Hydrocarbons, Spectral Line Width
Scientific paper
High quality spectra at 8-13 microns of five compact objects that display narrow infrared emission bands are presented. All of the objects display the well-known 11.25- and 8.56-micron features together with the long wavelength wing of the 7.7 microns band. In addition, weaker bands near 11.05 and 11.5 microns and/or 'plateau' emission between the 11.25- and 12.7-micron features are evident in some of the objects. There is considerable dispersion as to the equivalent width of the features from object to object. The premain sequence star TY CrA has a remarkable spectrum, displaying an especially pronounced feature at 11.05 microns, with an intensity 25 percent that of the 11.25-micron feature, and a very prominent 8.6-micron band. Overall, the structure apparent in the 11-13-micron region is reflected in the prominence of the 8.6-micron feature and the complexity in the emission features near 3 microns. The observations are discussed in terms of emission from polycyclic aromatic hydrocarbons.
Aitken David K.
Roche Patrick F.
Smith Cotton H.
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