Abstract

The possibility that large-scale coronal loops of solar-type stars and M dwarfs make a significant contribution to the white-light continuum emission is considered. It is shown that that the existence of high-density (>10¹² cm^–3) coronal loops contradicts the standard model of solar and stellar flares. As a result, the optical flare emission cannot be determined by free–free or free–bound processes within loops. The contribution from the lower atmosphere, which is heated beneath the loops due to the irradiation of soft X-ray emission, should be also negligible. The possible alternative scenarios are discussed.

中文翻译：

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日冕环和耀斑恒星的光辐射

摘要

考虑到太阳型恒星和M矮星的大规模日冕环对白光连续体发射做出重大贡献的可能性。结果表明，高密度（> 10 ¹² cm ^–3）的日冕环的存在与太阳耀斑和恒星耀斑的标准模型相矛盾。结果，无法通过环路内的自由-自由或自由-束缚过程来确定光耀斑的发射。下部大气的影响也应忽略不计，下部大气由于软X射线的辐射而在回路下方被加热。讨论了可能的替代方案。