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super-excitatio

International Astronomical Union Colloquium (1)

International Astronomical Union (1)

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Observations of ζ Aurigae Stars and Their Interpretation
H. G. Groth
Journal:

International Astronomical Union Colloquium / Volume 2 / August 1970

Published online by Cambridge University Press:

08 February 2017, pp. 283-289

Print publication:

August 1970
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A summary of information on the extended atmosphere of the K component coming from three eclipsing binaries consisting of a K supergiant and a main sequence B star. Various anomalies exist: (1) Discrepancy between electron density and metallic density inferred from observations, noting that the electrons should come from the metals. This suggests a cloud structure in the atmosphere. (2) Anomalous excitation temperatures and populations of the second quantum level of hydrogen suggests a solar-chromosphere type behavior for these K atmospheres. (3) Significant changes in the profiles of the Ca+ lines from one eclipse to another. The necessity to distinguish between effects coming from radiation of the B star on the K atmosphere and chromosphericlike effects is emphasized.