On the growth of carbonaceous grains in circumstellar envelopes.

Details On the growth of carbonaceous grains in circumstellar envelopes. On the growth of carbonaceous grains in circumstellar envelopes.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..891k&link_type=abstract

Astronomy and Astrophysics, v.313, p.891-896

Astronomy and Astrophysics

Astrophysics

9

Circumstellar Matter, Stars: Carbon, Stars: Agb, Stars: Mass Loss

Scientific paper

We present a phenomenological description of relevant aspects of the grain surface chemistry on pre-existing carbonaceous seed particles. The production of radical surface sites is calculated by means of modified analogous gas-phase thermodynamic and reaction kinetic data. Our results suggest that surface growth processes mainly take place at sp^3^ bonded carbon atoms rather than at the edges of graphitic plates or polycyclic aromatic hydrocarbons and that the resulting grain material will be amorphous diamond-like carbon. Furthermore, we argue that the sticking efficiency of the key growth species C_2_H_2_ at radical sites is high even for considerable grain drift velocities. The dust growth rate will generally be proportional to the radical surface coverage.

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