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Spectral-line broadening functions of W UMa-type binaries. II - AH VIR
Twenty-four 10 A/mm spectra of the W UMa binary AH Vir have beenanalyzed for radial velocities and for geometrical parameters of thesystem components by the method of spectral-line broadening functions.It is shown that the broadening functions determined through the linearrestoration process are much better defined than cross-correlationfunctions, even in the presence of broad spectral features. A newspectroscopic orbit for AH Vir has been determined on the basis ofradial velocity information contained in the broadening functions. Acombination of this orbit with a parallel solution for the geometricelements gave a new set of absolute elements of the system: a = 2.80solar radii, M1 = 1.36 solar mass, M2 = 0.41 solar mass, R1 = 1.40 solarradius, and R2 = 0.83 solar radius. The absolute bolometric magnitude ofthe system was found to be 4.07 m and the distance about 94 pc. AH Virbelongs to the OO Aq1 subclass of contact binaries which ischaracterized by the unusually low effective temperature for theobserved large dimensions. The radius of the primary is close to whatwould be expected if it obeyed the Main-Sequence mass-radius relation,but the luminosity of the system (most likely produced solely by theprimary component) is lower than that for the ZAMS. The underluminosityof the system is due to the abnormally low effective temperature whichremains significantly low after the energy transfer between componentsis taken into account.
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