Period variations of Algol-type eclipsing binaries AD And, TW Cas and Ⅳ Cas

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2018,（4）
• 页码范围: 115-122
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-4527/18/4/47

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 SuperWasp observations. We determined orbital parameters of 3rd 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.