Fractal Dust Grains around R Coronae Borealis Stars
Abstract
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.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1989
- DOI:
- 10.1086/185586
- Bibcode:
- 1989ApJ...346L..89W
- Keywords:
-
- Cosmic Dust;
- R Coronae Borealis Stars;
- Absorption Spectra;
- Graphite;
- Interstellar Extinction;
- Optical Properties;
- Ultraviolet Radiation;
- Astrophysics;
- INTERSTELLAR: GRAINS;
- STARS: R CORONAE BOREALIS