Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...215..603r&link_type=abstract
Astrophysical Journal, Part 1, vol. 215, July 15, 1977, p. 603-608.
Astronomy and Astrophysics
Astrophysics
7
Atmospheric Models, Late Stars, Stellar Atmospheres, Stellar Models, Stellar Spectrophotometry, Binary Stars, Electron Energy, Giant Stars, Photosphere, Spectrum Analysis, Stellar Spectra
Scientific paper
A semiempirical model photosphere is constructed for the K5 III star Alpha Tau. The technique employed is based on measurements of the central fluxes in a series of lines in multiplets. Observations of four multiplets having a range in excitation potential yield the excitation temperature as a function of the optical depth in a reference line. If the temperature structure of an assumed starting model is changed to force agreement between the observed and predicted line source functions under the assumption that excitation and electron kinetic temperatures are equal, the final semiempirical model is cooler by 150 K in the outer layers and warmer by 150 K in deeper layers than the theoretical model with the parameters adopted for Alpha Tau.
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