arXiv 1209.12792012-09-06astro-ph.SR

低主序星的基本性质

Fundamental properties of lower main-sequence stars

Guillermo Torres

备注：: 7 pages, to appear in the Proceedings of the 17th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, eds. K. Strassmeier & M. Lopez-Morales (AN, Vol. 334)
DOI：: 10.1002/asna.201211743

摘要：

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，半径差异的证据也在增加;然而，这些研究中很少有包括精确的温度测定。由于散射的增加，许多新发现论文中普遍存在的质量半径图变得更加混乱，这可能部分是由于影响许多已发表测量的大于实现的系统误差。本文从观测者的角度对这些问题和其他问题进行了讨论，并总结了解释半径和温度异常的理论努力。

英文摘要：

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.

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