A CCD Photometric Study of the W UMa Binary SW Lacertae

Volume 34 number 2 (2006)

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Kevin B. Alton

70

Dirk Terrell

Southwest

Abstract

Analysis of CCD data collected in V- and R-band over the last 3 months of 2005 has lead to a revised ephemeris and orbital period for SW Lac. A Roche-type model invoking a dark starspot on the cooler, more massive component has provided a theoretical fit of light curve data that largely accounts for the observed peak asymmetry and unequal successive maxima.