Fractal dust grains around R Coronae Borealis stars

Details Fractal dust grains around R Coronae Borealis stars Fractal dust grains around R Coronae Borealis stars

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346l..89w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. L89-L91.

Astronomy and Astrophysics

Astrophysics

36

Cosmic Dust, R Coronae Borealis Stars, Absorption Spectra, Graphite, Interstellar Extinction, Optical Properties, Ultraviolet Radiation

Scientific paper

Discrete dipole approximation calculations of the optical properties of random fractal aggregates of graphite spheroids show a UV absorption feature that is too wide and centered at too long a wavelength to fit the observed interstellar 2200-A feature, but which is a good match to the 2400-A feature seen in the hydrogen-deficient R CrB stars reported by Hecht et al. (1984). Graphite fractal grains also match the UV bump and large long-wavelenvth extinction seen in laboratory studies of carbon smoke published by Bussoletti et al. (1987), which are usually attributed to amorphous carbon.

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