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NAM2012 - All Presentation Details

Record 747 of 756

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The Dependence of Dust Formation Timescale on the Speed Class of Novae

Author: Steven Williams

Liverpool John Moores University

Co-Authors: M. F. Bode (Liverpool John Moores University), M. J. Darnley (Liverpool John Moores University), A. W. Shafter (San Diego State University), V. Zubko (U.S. Naval Observatory)

Session: STA2: Binary Stars: Duplicity is Everywhere

Presentation type: Talk      00:00  Poster Session B 


Dust formation in novae appears to depend strongly on how fast the nova optical light curve declines (their speed class). Using simple relationships of e.g. speed class with luminosity and ejection velocity, it can be shown that the dependencies effectively cancel, leaving dust formation essentially independent of speed class. After a nova outburst the spectrum of the central hot source evolves, with an increasing proportion of the radiation being more energetic than the Lyman limit. The rate at which the spectra evolve depend on the speed class. We have refined the models by assuming radiation at higher energies than the Lyman limit is absorbed by neutral hydrogen gas internal to the dust formation sites. Here we present the effect our theoretical refinement has on the relationship between dust formation timescale and speed class, where we now find a much more sensitive relation between these two quantities.

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