Mid-Infrared Spectra of Circumsteller Dust Debris around Main-sequence A and Late B Type Stars

Details Mid-Infrared Spectra of Circumsteller Dust Debris around Main-sequence A and Late B Type Stars Mid-Infrared Spectra of Circumsteller Dust Debris around Main-sequence A and Late B Type Stars

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8106m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #81.06; Bulletin of the American Astronomical Society, V

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We report spectra obtained with the IRS on board Spitzer Space Telescope in the 5-35 micron range of 15 nearby main-sequence A and late B type stars which have photometric excesses at 24 and 70 microns as measured by Spitzer’s MIPS instrument. Prominent spectral features are rare, suggesting that the bulk of the emitting particles have diameters larger than 10 microns. The principal results are: (1) In many cases, the excesses extend below 10 microns, thus overlapping the terrestrial planet zone around these stars. (2) For several stars, the entire excess out to 70 microns can be well-fit by a single power law F(nu) lambda^n, with n in the range 0.8 to 1.25; in several others, by a single black body continuum with T 200 K. (3) The other stars show composite spectral energy distributions.
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This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.

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