Fundamental properties of lower main-sequence stars
Fundamental properties of lower main-sequence stars
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较低主序星的基本特性
DOI：
10.1002/asna.201211743
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发表时间：
2012
影响因子：
0.9
通讯作者：
G. Torres
中科院分区：
文献类型：
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作者：
G. Torres
系外行星研究领域重新激发了人们对M矮星的兴趣，M矮星已成为多普勒和凌日观测的最佳目标。对它们的基本性质，如质量、半径和有效温度的精确测量揭示了与恒星演化理论预测的重大分歧，即恒星比预期的更大、更冷。这些异常被认为是由于这些恒星的高水平活动。多年来，随着越来越多的测定结果的出现，半径差异的证据也越来越多;然而，这些研究中很少包括对温度的准确测定。在许多新发现的论文中，无处不在的质量半径图由于散射的增加而变得更加混乱，这可能部分是由于影响许多已发表测量的系统误差大于实现的系统误差。本文从观测者的角度对这些和其他问题进行了讨论，沿着对解释半径和温度异常的理论工作进行了总结。（© 2013 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆）
The field of exoplanet research has revitalized interest in M dwarfs, which have become favorite targets of Doppler and transit surveys. Accurate measurements of their basic properties such as masses, radii, and effective temperatures have revealed significant disagreements with predictions from stellar evolution theory in the sense that stars are larger and cooler than expected. These anomalies are believed to be due to high levels of activity in these stars. The evidence for the radius discrepancies has grown over the years as more and more determinations have become available; however, fewer of these studies include accurate determinations of the temperatures. The ubiquitous mass-radius diagrams featured in many new discovery papers are becoming more confusing due to increased scatter, which may be due in part to larger than realized systematic errors affecting many of the published measurements. A discussion of these and other issues is given here from an observer's perspective, along with a summary of theoretical efforts to explain the radius and temperature anomalies. (© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)