SIMBAD references

We present a complete period analysis of eclipsing binary system HS Herculis. In order to increase the number of minimum times, we observed five new minima in 2002 and 2003. Using all available minimum times, we analyzed the O-C diagram of HS Her and we confirmed an apsidal motion with a period of about 77 years. According to the results of the detailed analysis, we determined that there is no third body in the system and the O-C curve can be explained with only apsidal motion.