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J. J. Johnson, T. E. Harrison, H. Osborne (New Mexico State University), D. M. Gelino (CASS/UCSD), G. S. Stringfellow (Univ. of Colorado-Boulder)
We present models of dust shells around novae (in particular Nova Cen 1991 and Nova Sco 1991), tracing how the density and temperature change as the shell expands and the nova itself evolves. It is clear that the evolution of the circumnova dust shell is more complex than a simple initial ejection and subsequent expansion. In particular, there is evidence for replenishment of the dust shell by further material being ejected by the nova after the initial outburst. It is also clear that dust shells must be clumpy in order to account for both the optical depth and temperature of the shells as well as the observed spectra of the novae.
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.