Silicate dust in a Vega-excess system

Details Silicate dust in a Vega-excess system Silicate dust in a Vega-excess system

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255p..31s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 1, 1992, p. 31P-36P.

Astronomy and Astrophysics

Astronomy

39

Cosmic Dust, Infrared Stars, Particle Size Distribution, Stellar Envelopes, Astronomical Spectroscopy, Interstellar Extinction

Scientific paper

The 10-micron spectrum of the K5V star SAO 179815 (= HD 98800) is presented, and conclusively demonstrates the presence of small silicate dust grains around this star. The 9.7-micron silicate dust feature is unusually broad and shallow in this system. This, together with the slow fall-off of flux at longer wavelengths, constrains the size and density distributions of dust grains in models of the disk. It is found that there must be a significant population of small grains, as well as a population of large grains in order to explain all the observed properties of the disk.

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