Abstract
New three color light curves of TY Boo were acquired during five nights from February to May 2006 in the BVR bandpass using a 50-cm F/8.4 Ritchey-Chr etien telescope (Ba50) at the Baja Astronomical Observatory (Hungary), with a 512 x 512 Apogee AP-7 CCD camera. A photometric solution of these light curves was obtained by means of the Wilson-Devinney code. The results showed that the less massive component is hotter than the more massive one, and the temperature difference between the components is Delta T similar to 249 K. Long term investigation of the system based on all available data shows two stages of increase and a similar trend for decrease, which appears to be periodic behavior. A set of new light elements yields a new period (P = 0.3171506(d)) and shows a periodic decrease with the rate dP/dE = 5.858 x 10(-12) d cycle(-1), 6.742 x 10(-9) d yr(-1) or 0.058 s century(-1). The evolutionary status of the system is discussed.