Astronomy and Astrophysics – Astronomy
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.1402c&link_type=abstract
American Astronomical Society, 198th AAS Meeting, #14.02; Bulletin of the American Astronomical Society, Vol. 33, p.807
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We have used the Keck I telescope to image at 11.7 μ m and 17.9 μ m the dust emission around HR 1998, a main sequence A-type star at 21.5 pc from the Sun with an infrared excess detected with IRAS. Even with a 0.57" FWHM point spread function, the excess is unresolved; we find a dust distance from the star of {<=} 6.1 AU suggesting that the dust may be contained within a massive asteroid belt. We infer a color temperature of Tdust = 350 K for the grains, consistent with black bodies at 2.9 AU from the star. If the dust grains surrounding HR 1998 have a similar size distribution as the asteroid belt, the total mass of dust around this object is estimated to be 2.3*E27 g or approximately a thousand times that contained within the main asteroid belt. Since HR 1998 has an estimated age between 100-400 Myr, it seems to possess a relatively young asteroid belt.
Chen Christine H.
Jura Michael
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