Published in Monthly Notices of the Royal Astronomical Society, Volume 358, January 1, 2005, pages 795-812.
Copyright © 2005 Royal Astronomical Society. Monthly Notices of the Royal Astronomical Society is published by Blackwell Publishing. The definitive version is available at at http://dx.doi.org/10.1111/j.1365-2966.2005.08751.x.
NOTE: At the time of publication, the author David Mitchell was not yet affiliated with Cal Poly.
We report on the discovery of 141 further variable stars found in the field of the open cluster NGC 6819. The stars were identified from time-series photometric data obtained on the Isaac Newton Telescope, La Palma, during two observing runs covering the 19 nights between 1999 June 22–30 and 1999 July 22–31. The variables found include 53 eclipsing binaries, of which eight stars appear to be RS CVns, in addition to 70 stars showing spot activity, 13 showing long-period variability and five variables of other types.