Short-period variations of the radial velocities of the eclipsing binary HD 193576 = V444 CYG

Astronomy and Astrophysics – Astronomy

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Eclipsing Binary Stars, Periodic Variations, Radial Velocity, Helium, Line Spectra

Scientific paper

Series of rest deviations from the mean radial velocity curve (Münch, 1950) of the HD 193576 eclipsing binary were processed to search for periodic variations. The most probable periods detected by four spectral lines are P1 = 0d.268, P2 = 0d.367, P3 = 0d.406, P4 = 0d.440. The P2 and P3 periods coincide with those recently found in variations of asymmetry of the He II λ4686 line.

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