Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982afz....18..375b&link_type=abstract
(Astrofizika, vol. 18, July-Sept. 1982, p. 375-385) Astrophysics (ISSN 0571-7132), vol. 18, no. 3, Jan. 1983, p. 228-234. Transl
Astronomy and Astrophysics
Astrophysics
11
Atmospheric Models, Stellar Atmospheres, Stellar Models, Supergiant Stars, Atmospheric Temperature, Atmospheric Turbulence, Chromium, F Stars, Iron, Line Spectra, Titanium, Velocity Distribution
Scientific paper
An investigation of the bright supergiant Canopus (Alpha Car, FO Ib-II) is presented based on high dispersion spectroscopic data obtained by Castley and Watson (1980) and on the model atmospheres of Kurucz (1979). It is determined that the effective temperature is 7400 + or - 150 K and the value of the surface gravity is log g = 1.9 + or - 0.2. It is found that lines of the ions Ti II, Cr II, and Fe II lead to higher values of the microturbulence velocity than the Fe I lines. It is shown that the atmosphere of Canopus does not develop such pronounced supersonic microturbulence as has been found in the late F supergiants Alpha UMi, Gamma Cyg, and Rho Cas. In addition, the influence of errors in the damping on the determination of the chemical composition is examined.
Boiarchuk A. A.
Liubimkov L. S.
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