A model for Vega's dust shell

Details A model for Vega's dust shell A model for Vega's dust shell

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pazh...11..861m&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 11, Nov. 1985, p. 861-865) Soviet Astronomy Letters (ISSN 0360-0327), vol. 11, Nov.-Dec

Astronomy and Astrophysics

Astronomy

1

A Stars, Cosmic Dust, Stellar Envelopes, Stellar Evolution, Stellar Models, Grain Size, Infrared Spectra, Optical Thickness, Particle Size Distribution, Solar Atmosphere

Scientific paper

A simplified evolutionary model is proposed for the dust shell around Alpha Lyr, assuming that the grains retain the same size distribution as they proceed to coalesce. The infrared continuum predicted by the model will best fit the airborne and IRAS data for Vega if it has shell mass 0.0002 solar mass, radius 100 AU, and age 100 Myr. Comparison with a similar model calculated for the circumsolar dust nebula implies that A-star dust shells should have a much larger optical depth, and thus be more readily detectable in the infrared, than the shells around later-type stars.

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