Statistics – Computation
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233...65f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, July 1, 1988, p. 65-78.
Statistics
Computation
41
Carbon, Photosphere, Stellar Envelopes, Supergiant Stars, Variable Stars, Computational Astrophysics, Light Curve, Stellar Atmospheres, Stellar Temperature, Thermodynamics, Ultraviolet Spectra
Scientific paper
The theory of homogeneous nucleation is applied to the formation of carbon dust grains in the envelopes of R CrB stars with absolute magnitude M(bol) = -5 mag and effective temperatures from 3000 to 8000 K. The radius of the inner boundary of the grain-forming region is shown to rapidly increase with both increasing effective temperature and decreasing mass flux. For stars with effective temperature of about 7000 K, such as R CrB, RY Sgr and XX Cam, this radius exceeds the radius of the photosphere by a factor of 20 or even more. The final size of dust grains is a sensitive indicator of mass flux. Both the final radii of dust grains and the theoretical light curves agree with observations of RY Sgr for mass fluxes ranged from 3 x 10 to the -8th to 0.000001 solar masses/year, gas and condensing material being ejected in the cone. Connection between the pulsation phase and commencement of the deep light minimum is assumed to be caused by variations of the effective temperature due to stellar pulsations.
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