Gravity darkening of the secondary component of Algol |
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| Authors: | Edwin Budding Zdeněk Kopal |
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| Institution: | (1) Dept. of Astronomy, University of Manchester, England |
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| Abstract: | An analysis of the infrared light curve of the secondary minimum of the Algol system — when the contact subgiant component of spectral class K0 undergoes eclipse by its nearly spherical and early-type mate — for the gravity-darkening of the distorted contact star has disclosed that the monochromatic coefficient   of this darkening at =1.6  is some three to four timeslarger than that resulting from von Zeipel's theory. This is in agreement with recent photometric studies of gravity darkening in WUMa-type systems, but in flagrant contrast with the consequences of theories requiring deep sub-surface convection zones for subgiants of advanced spectral types. The origin of this discrepancy remains unresolved, and underlines the need of further observations of the secondary minima in semi-detached eclipsing systems in the infrared. |
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