Variable stars in the field of open cluster NGC 6819 |
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| Authors: | R AStreet KeithHorne T ALister APenny YTsapras AQuirrenbach NSafizadeh JCooke DMitchell ACollier Cameron |
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| Institution: | 1School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS; 2Astronomy Department, University of Texas, Austin, TX 78714, USA; 3Rutherford Appleton Laboratories, Chilton, Didcot, Oxon OX11 0QX; 4Center for Astrophysics and Space Sciences (CASS), University of California, San Diego, CA 92093, USA |
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| Abstract: | We report on the discovery of 25 variable stars plus 13 suspected variables 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 12 eclipsing binaries with an additional three suspected, nine BY Draconis systems, plus four variables of other types, including one star believed to be a Cepheid. Three of the 15 eclipsing binaries are believed to be cluster members. Details of a further 10 suspected variable stars are also included. |
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| Keywords: | binaries: eclipsing stars: variables: other open clusters and associations: individual: NGC 6819 |
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