摘要
We present new analyses of variations in O-C diagrams of three Algol-type eclipsing binary stars：AD And,TW Cas and IV Cas.We have used all published minima times（including visual and photographic）as well as newly determined ones from our and Super Wasp observations.We determined orbital parameters of 3^（rd） bodies in the systems with statistically significant errors,using our code based on genetic algorithms and Markov chain Monte Carlo simulations.We confirmed the multiple nature of AD And and the triple-star model of TW Cas,and we proposed a quadruple-star model of IV Cas.
We present new analyses of variations in O-C diagrams of three Algol-type eclipsing binary stars：AD And,TW Cas and IV Cas.We have used all published minima times（including visual and photographic）as well as newly determined ones from our and Super Wasp observations.We determined orbital parameters of 3^（rd） bodies in the systems with statistically significant errors,using our code based on genetic algorithms and Markov chain Monte Carlo simulations.We confirmed the multiple nature of AD And and the triple-star model of TW Cas,and we proposed a quadruple-star model of IV Cas.
基金
supported by a grant from the Slovak Research and Development Agency with number APVV-15-0458
by realization of the project ITMS (No. 26220120029)
the European Regional Development Fund
the project VEGA (2/0143/14)
