论文标题
大多数EL CVN系统是层次三元组的内部二进制文件
Most EL CVn systems are inner binaries of hierarchical triples
论文作者
论文摘要
尽管它们对现代天文学的重要性很重要，但我们并不完全了解从主要序列二进制恒星中至少包含一种白色矮人形式的近距离恒星。发现El CVN二进制文件，与A/F主序列伴侣的紧密白矮人矮人相关，现在提供了测试紧凑型二进制恒星形成模型的独特可能性。二进制进化理论预测，这些EL CVN恒星从轨道周期短的非常接近的主序列二进制物中降低。如果这是正确的，几乎所有的EL CVN星应是层次三元组的内部二进制组，因为发现超过95％的非常接近的主要序列二进制组（所谓的祖细胞系统）是分层三元组。我们在这里介绍了五个El CVN二进制文件的领域/IRDIS观察，如预测的那样，在所有第三纪对象中都发现了。我们得出的结论是，El CVN系统是分层三元组的内部二进制组，实际上是从经历稳定传质的非常接近的主序列二进制组中降下的。
In spite of their importance for modern astronomy, we do not fully understand how close binary stars containing at least one white dwarf form from main sequence binary stars. The discovery of EL CVn binaries, close pre-white dwarfs with A/F main sequence star companions, offers now the unique possibility to test models of close compact binary star formation. Binary evolution theories predict that these EL CVn stars descend from very close main sequence binaries with orbital periods shorter than 3 days. If this is correct, nearly all EL CVn stars should be inner binaries of hierarchical triples because more than 95 per cent of very close main sequence binaries (the alleged progenitor systems) are found to be hierarchical triples. We here present SPHERE/IRDIS observations of five EL CVn binaries, finding in all of them tertiary objects, as predicted. We conclude that EL CVn systems are inner binaries of hierarchical triples and indeed descend from very close main sequence binaries that experience stable mass transfer.
