Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ap%26ss.186....7e&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 186, no. 1, Dec. 1991, p. 7-20.
Astronomy and Astrophysics
Astrophysics
3
A Stars, Binary Stars, Light Curve, Stellar Luminosity, Ultraviolet Radiation, Iue, Stellar Envelopes, Stellar Gravitation, Stellar Models
Scientific paper
The light curve of V535 Ara is determined from observations of this long-period W UMa binary in the UV, and its gravity darkening is estimated. The UV colors and spectral type correspond to (B - V)0 = 0.24, or A8V, and imply that the star should have very little residual convection in its envelope. It is concluded that the gravity darkening is large, as in a radiative star, unless it is modified by circulation in the common envelope, or unless all stars this warm are convective. Four solutions are obtained to a combination of optical and UV light curves, two for high radiative gravity darkening, and two for low convective gravity darkening. The light curves were fitted equally well in all four cases, while in all but the one with low-gravity darkening and a hot inner face there was a rather large global temperature difference between the two stars. It is suggested that the W UMa binaries are found only at spectral types later than about A8 because their outer envelopes must be convective to transfer luminosity.
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