论文标题
过渡性毫秒的脉冲星PSR J1023+0038的特殊化学丰度 - LI增强
The peculiar chemical abundance of the transitional millisecond pulsar PSR J1023+0038 -- Li enhancement
论文作者
论文摘要
使用高分辨率的光谱法，我们确定了二元毫秒Pulsar PSR PSR J1023+0038中次级恒星的化学丰度。我们测量的金属度为[Fe/H] = 0.48 +/- 0.04，该金属性高于太阳值，并且通常发现与X射线二进制文件中的次级恒星相比，元素的丰度与X射线二元和恒星的太阳邻居中的太阳邻域中的恒星有所不同。我们的结果表明，脉冲星是在超新星爆炸中形成的。我们发现，超新星在超新星处理过的物质是由次级恒星捕获的，导致丰富的异常，这与观察值质量一致。我们测量A（li）= 3.66 +/- 0.20的LI丰度，与具有相同有效温度的恒星相比，这异常高，而与系统年龄相同。此外，PSR J1023+0038中的LI丰度高于宇宙价值，并且在年轻人口I恒星中观察到了什么，因此为新鲜的LI生产提供了明确的证据。最有可能的解释是通过散布在次级恒星的大气中与CNO核与CNO核与CNO核的高能量伽马射线或相对论质子的相互作用，从而导致次级恒星大气中的大量li富集。
Using high-resolution optical spectroscopy we determine the chemical abundance of the secondary star in the binary millisecond pulsar PSR J1023+0038. We measure a metallicity of [Fe/H] = 0.48 +/- 0.04 which is higher than the Solar value and in general find that the element abundances are different compared to the secondary stars in X-ray binaries and stars in the solar neighbourhood of similar Fe content. Our results suggest that the pulsar was formed in a supernova explosion. We find that supernova models, where matter that has been processed in the supernova is captured by the secondary star leading to abundance anomalies, qualitatively agree with the observations. We measure Li abundance of A(Li) = 3.66 +/- 0.20, which is anomalously high compared to the Li abundance of stars with the same effective temperature, irrespective of the age of the system. Furthermore, the Li abundance in PSR J1023+0038 is higher than the Cosmic value and what is observed in young Population I stars and so provides unambiguous evidence for fresh Li production. The most likely explanation is the interaction of high energy gamma-rays or relativistic protons from the pulsar wind or intrabinary shock with the CNO nuclei in the secondary star's atmosphere via spallation which leads to substantial Li enrichment in the secondary star's atmosphere.
