Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200...71m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 71-82.
Astronomy and Astrophysics
Astronomy
35
Carbon Stars, Greenhouse Effect, Stellar Atmospheres, Stellar Envelopes, Stellar Models, Stellar Temperature, Absorptivity, Abundance, Black Body Radiation, Photosphere, Silicon Carbides
Scientific paper
The first evidence for the inverse greenhouse effect is adduced from the case of the IRC + 10216 carbon star's expanding and cooling atmosphere. The conventional use of supersaturation ratios to determine when solids condense is invalidated by calculations using the Planck mean absorption coefficient, which show that silicon carbide grains close to the star would be cooler, and graphite grains hotter, than if they were blackbodies. Graphite grain formation is therefore inhibited, and silicon carbide grain formation is enhanced. In light of this, silicon carbide will condense close to the star, while graphite will do so much farther out. It is suggested by the abundance of 18 extended envelope molecules that unlike carbon, silicon carbide has condensed at 1250 K. This is in keeping with recent IR models which suggest that graphite is not present within five stellar radii of a given star's surface.
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