The Visual Era of the AAVSO Eclipsing Binary Program
David B. Williams
Marvin E. Baldwin
Presented at the 100th Annual Meeting of the AAVSO, October 5, 2011; received January 23, 2012; accepted January 23, 2012
The beginning of eclipsing binary minima timings by visual observers in North America is described, and the history of the AAVSO’s Eclipsing Binary Committee during the era of visual observation is outlined, with particular attention to the observational programs, the production of charts and ephemerides, and the reduction and publication of the minima timings. During the period 1965–2005, AAVSO observers timed more than 17,000 minima, determined periods and light-curve types for neglected and newly discovered eclipsing binaries, and improved the light elements and corrected erroneous periods for many more.