The Case for Third Bodies as the Cause of Period Changes in Selected Algol Systems
The Case for Third Bodies as the Cause of Period Changes in Selected Algol Systems
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DOI：
10.1086/508411
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发表时间：
2006-10
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影响因子：
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通讯作者：
D. Hoffman;T. Harrison;B. McNamara;W. T. Vestrand;J. Holtzman;T. Barker
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文献类型：
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作者：
D. Hoffman;T. Harrison;B. McNamara;W. T. Vestrand;J. Holtzman;T. Barker
许多食双星系统的轨道周期呈现长期变化，这在它们的O - C（观测周期减去计算周期）图中很明显。利用机器人光学瞬变搜索实验（ROTSE - I）在SkyDOT数据库中汇编的数据、新墨西哥州立大学1米望远镜的数据以及美国变星观测者协会（AAVSO）近期的数据，我们重新研究了博尔科维茨和赫格迪什所提出的食双星中存在第三天体效应的最佳候选案例：仙女座AB、御夫座TV、仙王座XX和武仙座AK。我们还研究了在鹿豹座Y周围存在第三天体的可能性。我们的新数据支持了他们的观点，即除武仙座AK外，所有系统中都存在第三天体，这从O - C残差的正弦变化中可以看出。我们的新数据表明，仅第三天体无法解释武仙座AK的O - C残差中所观察到的变化。我们还提供了一个包含143个食双星系统的表格，这些系统有美国变星观测者协会的历史O - C数据以及从SkyDOT数据库计算出的新值。
Many eclipsing binary star systems show long-term variations in their orbital periods, evident in their O - C (observed minus calculated period) diagrams. With data from the Robotic Optical Transient Search Experiment (ROTSE-I) compiled in the SkyDOT database, New Mexico State University 1 m data, and recent American Association of Variable Star Observers (AAVSO) data, we revisit Borkovits and Hegedüs's best-case candidates for third-body effects in eclipsing binaries: AB And, TV Cas, XX Cep, and AK Her. We also examine the possibility of a third body orbiting Y Cam. Our new data support their suggestion that a third body is present in all systems except AK Her, as is revealed by the sinusoidal variations of the O - C residuals. Our new data suggest that a third body alone cannot explain the variations seen in the O - C residuals of AK Her. We also provide a table of 143 eclipsing binary systems that have historical AAVSO O - C data with new values computed from the SkyDOT database.