Studying the stellar surface structure and magnetic cycles in very active stars using Doppler imaging and long-term photometric observations

在其他现象中，磁性活跃的恒星会在其表面上表现出由于磁性阻挡对流而产生的冷点。在某些恒星上可以看到的翻转现象中，主要的光点区域在经度上迅速移动了180°。这种行为是一种首先在恒星上观察到，然后在太阳上搜索和发现的磁活动的例子。这一现象背后的机制尚不清楚，它可能代表了一个全新的物理过程，因此对发电机理论和对太阳的理解提出了新的挑战。要想了解这一现象，需要集中精力进行比迄今为止更详细的观察。我们建议详细研究这一现象，使用：a）时间序列的多普勒图像获得高时间分辨率的精心挑选的目标B）同时高精度光度和c）结合新的光度数据与现有的长期光度观测。该项目的目的是建立一个详细的图片的flip-flop在行动和相关的flip-flop现象与其他恒星参数，提供一个更好的基础，解释这一显着的现象在发电机理论。

Magnetically active stars exhibit, among other phenomena, cool spots on their surface due to magnetically blocked convective flows. In the flip-flop phenomenon, which is seen on some of these stars, the dominant spot region shifts rapidly by 180° in longitude. This behaviour is an example of a type of magnetic activity first observed on stars and then searched for and found on the Sun. The mechanism behind this phenomenon is not known and it may represent a totally new physical process, and as such a new challenge to dynamo theory and the understanding of the Sun. Progress in understanding this phenomenon requires the focused effort of much more elaborate observations than what exists to date. We propose to investigate this phenomenon in detail using: a) time-series of Doppler images obtained with high time resolution of well selected targets b) simultaneous high-precision photometry and c) combining the new photometric data with the existing long-term photometric observations. The aim of this project is to build a detailde picture of the flip-flop in action and correlate the flip-flop phenomenon with other stellar parameters, giving a better basis for interpreting this remarkable phenomenon within the dynamo theory.