New Observations of Three Lyra Variables (Abstract)

Volume 37 number 2 (2009)

Jerry D. Horne

Abstract

(Abstract only) New V-, B-, Ic-, and R-band photometry is obtained for V480 Lyr, V575 Lyr, and GSC 2118-0402. These new observations, when combined with other published observational data, allowed the determination of multiple period values for each star. From its multi-period behavior and from an examination of other intrinsic parameters, V480 Lyr was determined to be that of an RV Tauri type star, which differs from earlier classifications of the star. The new observational data on the δ Sct variable V575 Lyr confirmed two earlier observed periods of this variable star and identified an additional third period of pulsation. Additionally the precession of the primary period was identified, and new B–V, V–I, and V–R color indices were obtained. New observations of the V575 Lyr field star, GSC 2118-0402, are also examined and analyzed. These observations identified the range of magnitude variation and pulsation periods, which allowed the star to be tentatively classified as a δ Scuti variable.