Do the Infrared Emission Features Need Ultraviolet Excitation

Details Do the Infrared Emission Features Need Ultraviolet Excitation Do the Infrared Emission Features Need Ultraviolet Excitation

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.5010u&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #50.10; Bulletin of the American Astronomical Society, Vol. 29, p.1295

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of imaging spectroscopy of the reflection nebula vdB133, obtained with the infrared camera and circular variable filter wheel on the Infrared Space Observatory (ISO). Our observations reveal the infrared emission features (IEFs), at 6.2, 7.7, 8.6, 11.3, and 12.7 mu m, and associated 5 -- 15 mu m continuum emission. The stellar system illuminating vdB133 has the lowest ratio of ultraviolet (shortward of 0.4 mu m) to total flux of any stars demonstrated to date to excite the IEFs and associated continuum emission from adjacent interstellar dust, as opposed to circumstellar dust. The low fraction of UV flux from this system poses a problem for existing models for the emission mechanism and emitting material, which all require substantial UV radiation for the excitation of the IEFs and associated continuum.

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