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

Abstract 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±0.13 km s−1 and 8.30±0.16 km s−1, respectively, which are more accurate than before. The equivalent widths (EW) of the Li I 6707.8 A ̊ absorption line of HIP 544 and HIP 46843 are mea-sured to be 110±5 mA ̊ and 195±5 mA ̊ respectively. Based on these properties, HIP 544 is estimated to be 100–800 Myr old and HIP 46843 30–100 Myr old using three relatively creditable methods