NT Aps, a southern sky W UMa stellar system with a decreasing period : observers page

NT Aps, a W UMa star in the southern hemisphere was observed in white light in 2007 and B and V filter in 2008 using personal telescopes from South Africa. From the Hipparcos ephemeris of 1991 a decrease in period of ∼ 125 seconds year-1 for the binary is detected. Furthermore, software modeling packages of BINARY MAKER 3 and PHOEBE were employed to constrain the parameters of the binary components. The result of the modeling exercise is presented.