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Paper: New Systems Showing the Light-Time Effect
Volume: 349, Astrophysics of Variable Stars
Page: 379
Authors: Zasche, P.
Abstract: Two Algol-type eclipsing binary systems (EW Lyr and IV Cas) have been investigated for period changes. Our study was primarily focused on the light-time effect with an alternative explanation by magnetic activity cycles. In the case of EW Lyr we have found a third body in the orbit with a period of about 78 years, an amplitude A = 0.052 days and orbital eccentricity e = 0.57. For IV Cas the long period is 58 years, amplitude A = 0.034 days and zero eccentricity. With these results we are also able to calculate mass functions and minimal masses of these components.
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