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T Period Changes in the Eclipsing Binaries DG Lacertae and MZ Lacertae

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Jindřich Šilhán

Nicholas Copernicus Observatory and Planetarium, Kraví hora, CS-616 00 Brno 16, Czechoslovakia


Presented at the First European Meeting of the AAVSO Brussels, July 24-28, 1990




DG Lac and MZ Lac have been observed visually and studied on plates of the Sonneberg Sky Survey. The orbits of both systems proved to be eccentric. MX Lac displays apsidal motion and DG Lac shows a reflection effect. The orbital period of DG Lac increased abruptly in the early



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