Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..263j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 263-273.
Astronomy and Astrophysics
Astrophysics
83
Carbon Stars, Spheres, Stellar Atmospheres, Stellar Models, Opacity, Stellar Evolution, Stellar Luminosity, Stellar Structure, Stellar Temperature
Scientific paper
The effect of sphericity in carbon star atmospheres is investigated by comparing results of calculations of more than 200 model atmospheres for carbon stars in spherical with those in plane-parallel geometry for various combinations of the parameters Teff = 3400, 3100, 2800, 2500 K; log(g) = 0.5, -0.5, -1.0; C/O = 1.02, 1.35, 2.0; Z/Z-solar = 1, 1/2, 1/10; and M/M-solar = 0.7, 1.5, 3, 10, and 100. It is shown that, compared with the corresponding plane-parallel models, spherical models are cooler in the surface layers and the gas pressure is higher (e.g., for a 0.7 solar mass spherical model, a cooling of 100 K and an increase in gas pressure by a factor of 3 in the surface layers is found). The effect is largest for the low-gravity models and increases somewhat with increasing temperatures; on the other hand, the C/O and Z values have small effects on the response to sphericity. It was also found that only HCN line and the strongest lines of CO are sensitive to the effects of sphericity.
Johnson Hollis R.
Jorgensen Uffe G.
Nordlund Åke
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