On the physical model of dust around Wolf-Rayet stars

Details On the physical model of dust around Wolf-Rayet stars On the physical model of dust around Wolf-Rayet stars

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295..109z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 295, p. 109

Physics

35

Wolf-Rayet Stars, Stellar Models, Cosmic Dust, Infrared Spectra, Carbon, Stellar Envelopes, Stellar Physics, Electric Charge, Stellar Atmospheres

Scientific paper

The observational infrared spectra of a number of Wolf-Rayet stars of WC8-9 spectral classes are shown to be quite satisfactorily explained by making use of the detailed theoretical model of a dust shell made up of spherical amorphous carbon grains, the dynamics, growth-destruction, thermal and electrical charge balance of which are taken into account. The dust grains acquire mainly positive electrical charge, move with suprathermal drift velocities, and may grow up to 100-200 A as a result of implantation of impinging carbon ions. For most of the stars, the fraction of condensed carbon does not exceed 1 percent. While the nature of the grain nucleation remains unknown, the condensation distances and the grain seed production can be estimated by fitting the observational spectra with theoretical ones.

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