Ultraviolet colors of W Ursae Majoris - Gravity darkening, temperature differences, and the cause of W-type light curves

Details Ultraviolet colors of W Ursae Majoris - Gravity darkening, temperature differences, and the cause of W-type light curves Ultraviolet colors of W Ursae Majoris - Gravity darkening, temperature differences, and the cause of W-type light curves

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..919e&link_type=abstract

Astrophysical Journal, Part 1, vol. 239, Aug. 1, 1980, p. 919-927. Research supported by the Maria Sklodowska-Curie Fund and Ko

Astronomy and Astrophysics

Astrophysics

65

Astronomical Photometry, Eclipsing Binary Stars, Gravitational Effects, Ultraviolet Photometry, Albedo, Light Curve, Stellar Gravitation, Stellar Luminosity, Stellar Temperature

Scientific paper

The paper presents photometry of the prototype W UMa binary system in three ultraviolet bands with the ANS satellite. It was found that W UMa has low-gravity darkening beta of 0.03; that temperature differences between the components not established by gravity darkening are insignificant; and that the bolometric albedo is not very large. It was also found that W UMa is limb-darkened in the ultraviolet region, and that the inner hemisphere of the less massive component is hotter than that predicted by gravity darkening and the reflection effect. It was concluded that about 20% of the surface area of the component responsible for large gravity darkening is covered by dark spots distributed uniformly in the longitudinal direction. An observational value of the convective darkening exponent of 0.054 plus or minus 0.02 is proposed.

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