Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404..305e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 305-315.
Astronomy and Astrophysics
Astrophysics
20
Chromosphere, Zeta Aurigae Star, Binary Stars, Ionization, Iue, Stellar Magnetic Fields, Stellar Mass, Stellar Spectrophotometry
Scientific paper
The chromospheric structure of Zeta Aur is analyzed on the basis of both optical and UV data. Column densities of matter along different lines of sight through the chromosphere are measured by using both Ly-alpha wings and many lines of ionized metals, and they agree to within the errors of measurement. The chromosphere is seen to extend at least one stellar radius above the K4-5 Ib-11 supergiant's surface. Excitation temperature increases with height and attains values in the range 6500-12,000 K over much of the chromosphere. Turbulence of the gas is near 20 km/s, and may increase with height. Support of the chromosphere by magnetic fields is discussed, and this is found to predict a high degree of clumping of the gas.
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