Lithium abundances of 21 solar-type stars near the Sun

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• 作者：Li-Feng Xing^a ; ^{lfxing602@yahoo.com.cn} ; Shuang-Yi Zhao^b ; Xiao-Dong Zhang^a
• 关键词：Stars ; abundance ; Stars ; evolution ; Stars ; young solar-type stars
• 刊名：New Astronomy
• 出版年：2012
• 期刊代码：39_13841076
• 类别：ph
• 出版时间：July, 2012
• 卷：17
• 期：5
• 页码：537-541
• 文件大小：380 K

摘要

We present high-resolution spectroscopic observations for a sample of 21 young, solar-type stars near the Sun recently discovered in the X-ray wavelength range during the ROSAT all-sky survey. Based on these observations, we derive the lithium (Li) abundances of these 21 sample stars. Using the lithium abundances and the X-ray luminosity, we investigated the relationship between the Li abundances and the X-ray activity. We found a clear correlation between the lithium abundances and the X-ray luminosity: as the X-ray luminosity became stronger, the lithium abundance decreases in our sample stars. Our sample results provide further evidence that a correlation appears to exist between Li abundances, X-ray activity and age for a large number of solar-type stars. The results also confirm the presence of very active young stars close to the Sun, in agreement with recent findings from UV and X-ray surveys.