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eJAAVSO

A CCD Photometric Study of the W UMa Binary SW Lacertae

 

Kevin B. Alton

70 Summit Avenue, Cedar Knolls, NJ 07927

 

Dirk Terrell

Southwest Research Institute, 1050 Walnut Street #400, Boulder, CO 80302

 

Received April 20, 2006; accepted May 24, 2006

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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.

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