Radio Studies of Stellar Coronae, Winds, and Circumstellar Environments

对恒星射电辐射的研究提供了对发生在恒星日冕、风、磁层和恒星周围环境中的物理过程的补充和独特的见解。射电观测的独特之处在于它们能够揭示恒星大气中非热过程的存在，以及磁能释放地点或附近的磁场强度和结构。将在以下方面取得重大进展：演化中的巨星和超巨星的质量损失过程，包括风加速过程和风驱动机制(S)；活动双星的日冕结构和大星体脉冲和冷却阶段的物理过程；不同质量的主序星的热和非热射电发射，以及这些性质如何随着恒星的演化而变化；控制射电发射水平和恒星活动的基本过程，作为基本恒星参数和演化状态的函数；最后，恒星X射线日冕中的热过程和射电中观察到的非热日冕过程之间的物理和几何关系。

AST-0206367PI BrownThe study of stellar radio emission provides complementary and often unique insightsinto physical processes occurring in stellar coronae, winds, magnetospheres, and circumstellar environments. Radio observations are unique in their ability to reveal the presence of nonthermal processes in stellar atmospheres, as well as the magnetic field strength and structure at or close to the site of magnetic energy release.The investigations to be carried out here will allow significant advances in the study ofthe phenomenolgy and physical processes related to: the mass loss process from evolved giant and supergiant stars, including the wind acceleration process and the wind driving mechanism(s); the coronal structure of active binary stars and the physical processes occurring during the impulsive and cooling phases of the large are events in these systems; the thermal and nonthermal radio emission of main sequence stars of differing mass and how these properties change as such stars evolve; the fundamental processes controlling the level of radio emission and stellar activity in general as a function of basic stellar parameters and evolutionary state; and finally, the physical and geometrical relationship between thermal processes in stellar X-ray coronae and nonthermal coronal processes observed in the radio.***