论文标题
根据Gaia数据和锂测试识别附近的Young附近失控星星
Identification of young nearby runaway stars based on Gaia data and the lithium test
论文作者
论文摘要
附近的年轻逃亡星星适合寻找其原产地以及可能相关的物体，例如中子恒星。 Tetzlaff，Neuhäuser＆Hohle（2011）从Hipparcos中选择了Young（$ \ le 50 $ MYR）失控的明星候选人，他们估计了Hertzsprung-Russell图和进化模型的年龄。在这里，我们不仅通过使用新的Gaia DR2数据来重新确定或限制他们的年轻年龄，还可以通过测量锂，这是青年指标。对于308颗恒星，我们带了Spectra以6708 $ \ Unicode {XC5} $搜索锂7同位素的强共振双线。这些光谱是在2015年2月至2018年6月之间在大学天文台耶拿（Jena）的埃切尔（échelle）光谱仪Flechas进行的，2011年4月至2017年6月在Fred L. Whipple天文台进行了TRE。我们发现208颗恒星在光谱中有显着出现的锂，其中5颗可能年龄较小或大约50 MYR。这些目标中的三个甚至比GJ 182更近，GJ 182是最近已知的失控之星，约24 pc。这些恒星是年轻的失控恒星，适合从动态或超新星弹出器中进一步研究其起源。
Young nearby runaway stars are suitable to search for their place of origin and possibly associated objects, for example neutron stars. Tetzlaff, Neuhäuser & Hohle (2011) selected young ($\le 50$ Myr) runaway star candidates from Hipparcos, for which they had estimated the ages from the location in the Hertzsprung-Russell diagram and evolutionary models. Here, we redetermine or constrain their young ages more precisely not only by using the new Gaia DR2 data, but also by measuring lithium, which is a youth indicator. For 308 stars, we took spectra to search for the strong resonance doublet of the lithium-7 isotope at 6708 $\unicode{xC5}$. The spectra were taken with the Échelle spectrograph FLECHAS at the University Observatory Jena between February 2015 and June 2018 and with TRES between April 2011 and June 2017 at the Fred L. Whipple Observatory. We found 208 stars with significant occurrence of lithium in their spectra, and five possess a possible age younger or about 50 Myr. Three of these targets are even closer than GJ 182, the nearest known runaway star at about 24 pc. Theses stars are young runaway stars suitable for further investigation of their origin from either a dynamical or supernova ejection.
