Magnetic Activity-Related Radial Velocity Variation and its Effects on Extra-Solar Planet Detection

萨尔博士将研究恒星磁和表面现象的影响，如磁活动、旋转和星斑，对高精度径向速度测量的影响，这种测量用于探测太阳系外行星。他的目标是双重的。通过更好地了解由于恒星固有特性导致径向速度变化的原因，他计划验证当前的太阳系外行星候选者，并为当前和未来的行星搜索提供指导。他的工作还将提高对恒星光球中磁场与对流相互作用的理解，以及对流特性如何随恒星参数变化。他的大部分工作集中在对主序矮星样本的高分辨率光谱数据进行线平分线分析，这些数据有长期的光谱观测，涵盖了一系列基本的恒星参数，包括温度、活动水平和旋转特性。＊＊＊

Saar, Steven AST-9731652 Dr. Saar will investigate the effects of stellar magnetic and surface phenomena, such as magnetic activity, rotation, and starspots, on high-precision radial velocity measurements which are used for the detection of extra-solar planets. His goals are two-fold. By better understanding the cause of radial velocity variations due to intrinsic stellar properties, he plans to verify current extra-solar planet candidates and to provide guidance to current and future planet searches. His work will also lead to improved understanding of the interaction of magnetic fields with convection in stellar photospheres, and how convective properties vary with stellar parameters. Much of his work concentrates on performing an analysis of line bisectors from high resolution spectroscopic data of a sample of main-sequence dwarf stars which have long-term spectral observations and cover a range of basic stellar parameters in temperature, activity level, and rotation properties. ***