Abstract
The eclipsing binary system AI Dra reveals changes of its orbital period. These variations could be described as a result of orbiting the eclipsing pair around a common center of mass with two unseen companions with the periods about 18 and 43 years together with a steady period increase. Fourteen new minima observations were carried out by the authors.
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Zasche, P., Uhlář, R. & Svoboda, P. Period analysis of the eclipsing binary AI Dra. Astrophys Space Sci 326, 119–123 (2010). https://doi.org/10.1007/s10509-009-0197-1
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DOI: https://doi.org/10.1007/s10509-009-0197-1