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Paper: On the Nature of the Clocks of Double Periodic Variables
Volume: 335, The Light-Time Effect in Astrophysics: Causes and Cures of the O - C diagram
Page: 129
Authors: Mennickent, R.E.; Assmann, P.; Pietrzynski, G.; Gieren, W.
Abstract: We analyze times of maximum and minimum in the long-term light curves of the recently discovered double periodic variables in order to enlighten the nature of their photometric variability. Whereas it seems well established that the short-term variability is strictly periodic and seems to be well explained as ellipsoidal variations in a close binary system, we find the long-term variability not strictly periodic, with an hitherto unexplained origin.
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