Multiplicity among Solar-type Stars
Multiplicity among Solar-type Stars
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DOI：
10.3847/1538-4357/836/1/139
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
K. Fuhrmann;Rolf Chini;L. Kaderhandt;Zu-Cheng Chen
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文献类型：
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作者：
K. Fuhrmann;Rolf Chini;L. Kaderhandt;Zu-Cheng Chen
本文对距离小于25秒差距、主序有效温度Teff ≥ 5300 K的422颗恒星进行了全面的全天巡天多重数普查。非常类似于以前的结果，已提出的各种子集的调查，我们确认的正相关的恒星的多重性与初级质量。我们发现的F-和G-型星族I的恒星，58%是非单一的，21%是在三重或更高级别的系统。对于旧的中间盘和星族II的恒星--实际上都是G型和较小的G型--甚至三分之二的源被证明是非单一的。由于不断有新的发现，这些数字是下限，无偏的调查清楚地表明，太阳型场星的标准情况是一个氢燃烧源，至少有一个普通或简并的恒星伴星，并且令人惊讶的是，大量的恒星被组织在多个系统中。一个主要的结果是，轨道演化，包括形成蓝离散星，是一个潜在的重要问题，在所有的空间尺度和时间尺度的恒星系统的显着比例，特别是在第二星族恒星。我们讨论了一些最近的观测已知或怀疑的同伴在当地的调查，包括一个新的检测双线Ba-Bb子系统的视觉二进制HR 8635。
We present a multiplicity census for a volume-complete all-sky survey of 422 stars with distances less than 25 pc and primary main-sequence effective temperatures Teff ≥ 5300 K. Very similar to previous results that have been presented for various subsets of this survey, we confirm the positive correlation of the stellar multiplicities with primary mass. We find for the F- and G-type Population I stars that 58% are non-single and 21% are in triple or higher level systems. For the old intermediate-disk and Population II stars—virtually all of G type and less massive—even two out of three sources prove to be non-single. These numbers being lower limits because of the continuous flow of new discoveries, the unbiased survey clearly demonstrates that the standard case for solar-type field stars is a hydrogen-burning source with at least one ordinary or degenerate stellar companion, and a surprisingly large number of stars are organized in multiple systems. A principal consequence is that orbital evolution, including the formation of blue straggler stars, is a potentially important issue on all spatial scales and timescales for a significant percentage of the stellar systems, in particular among Population II stars. We discuss a number of recent observations of known or suspected companions in the local survey, including a new detection of a double-lined Ba-Bb subsystem to the visual binary HR 8635.