Graphite grains, carbon depletion and the 2200 A feature

Details Graphite grains, carbon depletion and the 2200 A feature Graphite grains, carbon depletion and the 2200 A feature

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..78..467b&link_type=abstract

Astrophysics and Space Science, vol. 78, no. 2, Aug. 1981, p. 467-471.

Astronomy and Astrophysics

Astrophysics

Carbon Stars, Graphite, Interstellar Extinction, Interstellar Matter, Particle Size Distribution, Interstellar Space, Stellar Atmospheres, Ultraviolet Radiation, Vapor Phases

Scientific paper

It has been shown by Millar (1979) that the 2200 A extinction hump is not in agreement with carbon depletion towards these stars if small graphite grains are assumed to be responsible for the hump. The present paper shows that this problem may be overcome if the presence in the interstellar space of graphite grains greater than 0.02 micron is taken into account. Large graphite particles which do not contribute to the ultraviolet extinction are sufficient to justify the observed carbon depletion. Ratios of the masses of the large grains to those of the small ones are derived. The largest sizes of the graphite particles are found to be in agreement with those needed to fit the interstellar extinction curve over the wavelength range 0.11-1 micron

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