Hydrogen-deficient atmospheres for cool carbon stars

Details Hydrogen-deficient atmospheres for cool carbon stars Hydrogen-deficient atmospheres for cool carbon stars

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..228j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 1, 1985, p. 228-230.

Statistics

Computation

12

Carbon Stars, Cool Stars, Hydrogen, Stellar Atmospheres, Stellar Composition, Abundance, Atmospheric Composition, Atmospheric Models, Stellar Spectrophotometry

Scientific paper

Motivated by recent work which hints at a possible deficiency of hydrogen in non-Mira N-type carbon stars and to further explore the parameter space of chemical composition, computations have been made of a series of hydrogen-deficient models for carbon stars. For these models Teff = 3000 K, and log g = 0.0. Solar abundances are used for all elements except for carbon (which is enhanced to give C/O = 1.05), hydrogen, and helium. As the fractional abundance of hydrogen is decreased, being replaced by helium, the temperature-optical depth relation is affected only slightly, but the temperature-pressure relation is changed. The most striking change in the emergent flux is the decrease of the H(-) peak at 1.65 micron compared with the blackbody peak at 1.00 micron.

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