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U Delphini: The Last 100 Years


Raymond R. Thompson

Maple Observatory

7 Welton Street

Maple, Ontario L6A 1R8



Received August 20, 1997; revised May 5, 1998




Using archival visual data from the AAVSO, photographic data from the Harvard College Observatory plate collection, and the author's photoelectric (V) data, an attempt was made to see how far back the 1100-day period of the semiregular variable U Delphini could be tracked.


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