首页> 中文期刊> 《天文和天体物理学研究:英文版》 >High resolution spectroscopy of two young active late type stars within 20 parsecs of the Sun

High resolution spectroscopy of two young active late type stars within 20 parsecs of the Sun

         

摘要

We present high-resolution optical echell spectroscopy of HIP 544 and HIP 46843, two nearby solar like stars. The discovery of these young stars at such a close distance to the Sun is really a surprising phenomenon. It will help us to have a better understanding of the structure and evolutionary history of the Milky Way. The radial ve- locities (RV) of HIP 544 and HIP 46843 are measured to be –6.88±0.13km s -1 and 8.30±0.16km s-1, respectively, which are more accurate than before. The equivalent widths (EW) of the Li I 6707.8 absorption line of HIP 544 and HIP 46843 are mea- sured to be 110±5m A and 195±5m A respectively. Based on these properties, HIP 544 is estimated to be 100–800Myr old and HIP 46843 30–100Myr old using three relatively creditable methods.

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