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BL Telescopii - A Rare Eclipsing Binary

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Janet H. Akyuz

Assistant to the Director, AAVSO, Cambridge, Massachusetts




BL Telescopii was discovered by Luyten in 1935 while searching for stars of high proper motion. Until 1948 this star was classified as an R CrB type variable by Kukarkin and Parenago. However, Cousins at the royal Observatory in South Africa observed this star visually from 1939 to 1945 and decided that it was a long period eclipsing binary. On the basis of his observations minima were observed on the predicted dates and it is accepted today that this star is an eclipsing binary.


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