Variable Stars Common Observation
Mission in Particular Areas of the Sky
SS Lacertae: The non-eclipsing eclipsing binary
by Ivan Adamin in March-April 2014 (#5)
Among the brighter members of the open cluster NGC 7209, SS Lacertae has gained considerable attention during the past decades due to its extraordinary behavior, not typical of eclipsing systems: the complete cessation of eclipses in the middle of the twentieth century. SS Lac belongs to a small class of triple systems in which changes due to dynamical effects can be seen over a single human lifetime.
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