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Multi-color photometric light curves of NO Cam in $V$ $R_C$ and $I_C$ bandsare obtained and analyzed simultaneously using the Wilson-Devinney (W-D)program. The solutions suggest that NO Cam is an A-subtype overcontact binarywith its mass ratio to be $q = 0.439$ and a contact degree of $f = 55.5\,\%$.The small temperature difference ($\Delta T = 44K$) between its two componentsindicates that the system is under thermal contact. The high orbitalinclination ($i = 84.5^{\circ}$) strengthens our confidence in the parametersdetermined from the light curves. All available times of minimum light arecollected and period variations are analyzed for the first time. The $O - C$curve reveals that its period is increasing continuously at a rate of$dP/dt=+1.46\times{10^{-9}}$, which can be explained by mass transfer from theless massive component to the more massive one. After the upward parabolicvariation is subtracted, the residuals suggest that there may be a cyclicvariation with a period of 2.23 years and an amplitude of $A_3 = 0.00153$ days,which may due to the light-travel time effect (LTTE) arising from thegravitational influence of a close-in tertiary component. The close-incompanion reveals that early dynamic interaction among triple system may haveplayed very important role in the formation of the W UMa type binaries.

Multi-color photometric investigation of the totally eclipsing binary NO Cam