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Is V899 Herculis an unsolved quadruple system containing double close binary stars?

Qian, S. -B.; Liao, W. -P.; He, J. -J. +2 more

Orbital period variation of the W UMa-type eclipsing binary, V899 Herculis, discovered by the Hipparcos satellite was investigated based on all available photoelectric and CCD times of light minimum. It is discovered that the orbital period of the binary shows a cyclic change with an amplitude of 0.0117 days. The cyclic period change can be explai…