Other
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221..663m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 1, 1986, p. 663-671. SERC-supported research.
Other
10
Electrostatic Charge, Grains, Isothermal Processes, Novae, Stellar Envelopes, Stellar Evolution, Graphite, Hydrogen Ions, Optical Thickness, Plasma Density
Scientific paper
The effect of grain charge on grain destruction in the isothermal dust-shell phase of moderate-speed novae is investigated theoretically, extending and refining the models developed by Mitchell et al. (1983) and Mitchell and Evans (1984) for NQ Vul at its IR maximum. Numerical results showing the dependence of both the electrostatic potential and the chemisputtering lifetime of 600-nm graphite grains on plasma density and dust-shell optical depth are presented in graphs and discussed in detail. Sputtering leading to grain destruction is found to begin in the outer regions when the shell becomes optically thick, reducing the charge of the grains, and to end when the shell becomes optically thin again. The sputtering rate derived is shown to imply a plasma density of about 10 to the 8th/cu cm for NQ Vul.
Albinson J. S.
Evans Aaron
Mitchell M. R.
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