B-Cirrus: Investigation of grain processing in moderate radiation fields

Details B-Cirrus: Investigation of grain processing in moderate radiation fields B-Cirrus: Investigation of grain processing in moderate radiation fields

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30790f&link_type=abstract

Spitzer Proposal ID #30790

Computer Science

Scientific paper

We propose IRAC and MIPS maps of infrared cirrus surrounding two embedded B stars, HR 5336 and HR 890. Previous IRAS investigations of these sources show that 12 and 25 micron emission is deficient relative to the 100 micron emission in the vicinity of the star. The mid-infrared emission deficits have been interpreted as destruction of the polycyclic aromatic hydrocarbons (PAHs) and very small grains (VSGs) responsible for the mid-infrared emission. The 25 micron emitters appear to be more depleted than the 12 micron emitters suggesting that VSGs are less robust than PAHs. The proposed observations will provide a high resolution, detailed study of the abundance of PAHs, VSGs and large grains as a function of distance from the embedded object and radiation field. The abundances will be compared to current generation grain models and will provide information on the processing of VSGs and PAHs in moderately enhanced radiation fields.

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