活动对恒星温度和半径的影响
The effect of activity on stellar temperatures and radii
摘要：
最近对低质量食双星的分析揭示了观测与恒星结构模型预测之间的重大分歧。结果表明，理论模型低估了小质量恒星的半径，高估了其有效温度，但产生的光度与观测结果一致。一个基于恒星活动影响的假说被提出来解释这种差异。在本文中，我们研究了存在相同的趋势，在单个活动的恒星，并提供了一个一致的情况下，解释系统的差异，活动和不活动的恒星在H-R图报告较早。分析是使用光谱类型晚K和M的单场星进行的，并通过红外颜色和光谱指数计算它们的辐射热星等和温度。对活跃星和不活跃星样本中的恒星性质进行了统计比较，以揭示系统差异。在考虑了一些可能的偏差效应后，活跃恒星比类似光度的不活跃恒星更冷，因此也意味着更大的半径，其比例与食双星中发现的比例非常一致。目前的研究结果概括了存在的强半径和温度依赖于恒星活动的低质量恒星的整个人口，无论他们的成员在紧密的二元系统。
英文摘要：
Recent analyses of low-mass eclipsing binary stars have unveiled a significant disagreement between the observations and the predictions of stellar structure models. Results show that theoretical models underestimate the radii and overestimate the effective temperatures of low-mass stars but yield luminosities that accord with observations. A hypothesis based upon the effects of stellar activity was put forward to explain the discrepancies. In this paper we study the existence of the same trend in single active stars and provide a consistent scenario to explain systematic differences between active and inactive stars in the H-R diagram reported earlier. The analysis is done using single field stars of spectral types late-K and M and computing their bolometric magnitudes and temperatures through infrared colours and spectral indices. The properties of the stars in samples of active and inactive stars are compared statistically to reveal systematic differences. After accounting for a number of possible bias effects, active stars are shown to be cooler than inactive stars of similar luminosity therefore implying a larger radius as well, in proportions that are in excellent agreement with those found from eclipsing binaries. The present results generalise the existence of strong radius and temperature dependences on stellar activity to the entire population of low-mass stars, regardless of their membership in close binary systems.
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