The outer atmospheres of cool M dwarfs

冷 M 矮星的外层大气

• 批准号: 397701660
• 负责人: Professor Dr. Jürgen H.M.M. Schmitt
• 金额: --
• 依托单位: Hamburger Sternwarte
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/397701660?language=en
• 关键词: outer; atmospheres; cool; dwarfs

M dwarfs are known to exhibit vastly different levels of magnetic activity, manifesting itself in star spots, X-ray emission and - at optical wavebands - chromospheric emission lines. In order to better understand the physics of these heated outer atmospheric layers for different spectral sub-types and activity levels among M dwarfs, we propose to perform 1D and 3D chromospheric modeling for these stars in the framework of this funding application. We specifically propose to compute both 3D chromospheric models and 1D chromospheric models and check, if the atmospheric inhomogeneities can be accounted for by single or linear combinations of 1D models, and juxtapose this modeling with state-of-the-art observations obtained by CARMENES. We therefore propose to use the atmosphere code PHOENIX for constructing a model grid of classical 1D chromospheres for M dwarfs and confront our modeling with high-resolution spectral observations taken with the CARMENES spectrograph. For selected objects we propose to perform a detailed comparison between observed and modeled spectra to better characterize the physics of the chromospheres of the selected individual stars.

已知M矮星表现出截然不同的磁活动水平，表现在星星斑点，X射线发射和-在光学波段-色球发射线。 为了更好地了解M矮星中不同光谱子类型和活动水平的这些加热外层大气层的物理学，我们建议在此资助申请的框架内对这些恒星进行1D和3D色球建模。 我们特别建议计算3D色球模型和1D色球模型和检查，如果大气的不均匀性可以通过单个或线性组合的1D模型，并将这种建模与CARMENES获得的最先进的观测。 因此，我们建议使用大气代码PHOENIX来构建M矮星的经典1D色球模型网格，并使用CARMENES光谱仪进行高分辨率光谱观测。 对于选定的对象，我们建议进行详细的比较观测和建模的光谱，以更好地描述物理的色球的选定的个别恒星。