Statistics – Computation
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293..154s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 293, June 1, 1985, p. 154-164.
Statistics
Computation
9
Carbon Stars, Planetary Nebulae, R Coronae Borealis Stars, Stellar Envelopes, Abundance, Convection, Hertzsprung-Russell Diagram, Ionization
Scientific paper
Stellar envelopes rich in carbon were computed, taking envelope carbon opacities into account that were hitherto unavailable. Various carbon effects were taken into account and the possible changes in the resulting envelope were investigated. It is found that below 6000 K carbon increased the opacity, due to molecular effects. The opacity peak around 10,000 K was dramatically reduced due to carbon enrichment. From 20,000 to 300,000 K, carbon reduced the opacity by a small amount. Above 300,000 K, carbon increased the opacity by about 20 percent. Carbon did not change the depth of convection in temperature, although in some cases it did drive convection considerably deeper in mass, at a fixed T(e). Carbon shifted stars considerably to the blue in the H-R diagram, leading to a considerably shallower convection in mass, for stars at a fixed envelope mass. Computationally, carbon could be simulated by an equal mass of hydrogen.
Boothroyd Arnold I.
Sackmann I.-Juliana
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