Gravity Darkening of the Secondary Component of Algol

Details Gravity Darkening of the Secondary Component of Algol Gravity Darkening of the Secondary Component of Algol

Dec 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970ap%26ss...9..343b&link_type=abstract

Astrophysics and Space Science, Volume 9, Issue 3, pp.343-352

Astronomy and Astrophysics

Astrophysics

17

Scientific paper

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 τλ of this darkening at λ=1.6 μ 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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