Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67....7d&link_type=abstract
Astronomy and Astrophysics, vol. 67, no. 1, June 1978, p. 7-14. Research supported by the Fonds National Suisse pour la Recherch
Astronomy and Astrophysics
Astrophysics
5
Abundance, Carbon Stars, Line Spectra, Lithium, Stellar Atmospheres, Stellar Spectra, Atmospheric Models, Spectral Line Width, Stellar Envelopes, Thermodynamic Equilibrium
Scientific paper
Kinetic-equilibrium (KE) calculations of neutral lithium lines in carbon stars have been performed. The transfer and statistical-equilibrium equations are solved simultaneously by the flux divergence method. The lithium atom model consists of four levels and the continuum. The photospheric models correspond to effective temperatures of 3800, 3600 and 3500 K, a surface gravity of log g equals 10, and a C/O abundance ratio equal to 1.3. The microturbulence is set equal to 5 km/s. The influence of possible chromospheric radiation into the photosphere is examined. This radiation and the lithium abundance are the free parameters, and their influence on the line profiles and equivalent widths is studied. It is shown that the results can be used to distinguish a hot chromosphere from a cold one. Independent LTE calculations have been performed for comparison with the results of the KE calculations. Appreciable non-LTE effects are found only for the resonance transition at 6708 A.
de La Reza Ramiro
Querci Francois
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