论文标题
硅孔的红色超巨星锂检测
Lithium detection in red supergiant stars of the Perseus complex
论文作者
论文摘要
我们介绍了在年轻的珀尔修斯复合体中27个红色超级巨人（RSG）的化学均匀样品中锂丰度的首次系统研究。对于这些恒星，已经通过高分辨率光学光谱和近红外光谱获得了精确的恒星参数以及铁和铁峰，CNO，Alpha，Light和中子捕获元件的详细化学丰度。观察到的RSG具有半极金属性，10-30 MYR年龄，授权光度为10 $^4 $ -10 $ -10 $^5 $ l $ _ {\ odot} $范围以及9-14 M $ _ $ _ {\ odot} $ rangage ins的质量。我们在观察到的27个K和M型RSG中的八个中检测到光学I I Doublet，发现相对较低的A（LI）$ <$ 1.0 dex丰度，而其余的19个RSGS上限A（li）$ <$ -0.2 dex已设置为（LI）上限。温暖，较少的发光（即可能较少的量），较少的混合（即较低的[c/n]和$^{12} $ c/$ c/$^{13} $ c DEPTETION）rsgs li检测显示出较高的li含量。为了解释$ \ sim $ 30 \％观察到的RSG的LI检测，我们推测应该在后梅因序列演变期间发生某种随机性和在对流气氛和/或二级生产中被完全破坏的情况。
We present the first systematic study of lithium abundance in a chemically homogeneous sample of 27 red supergiants (RSGs) in the young Perseus complex. For these stars, accurate stellar parameters and detailed chemical abundances of iron and iron peak, CNO, alpha, light and neutron-capture elements have been already obtained by means of high resolution optical and near-infrared spectroscopy. The observed RSGs have half-solar metallicity, 10-30 Myr age, bolometric luminosities in the 10$^4$-10$^5$ L$_{\odot}$ range and likely mass progenitors in the 9-14 M$_{\odot}$ range. We detected the optical Li I doublet in eight out of the 27 observed K and M type RSGs, finding relatively low A(Li)$<$1.0 dex abundances, while for the remaining 19 RSGs upper limits of A(Li)$<$-0.2 dex have been set. Warmer and less luminous (i.e. likely less massive) as well as less mixed (i.e. with lower [C/N] and $^{12}$C/$^{13}$C depletion) RSGs with Li detection show somewhat higher Li abundances. In order to explain Li detection in $\sim$30\% of the observed RSGs, we speculate that some stochasticity and a scenario where Li was not completely destroyed in the convective atmospheres and/or a secondary production took place during the post-Main Sequence evolution, should be at work.
