arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1701.05201astro-ph.SR
收藏

晚型Be星$β$ CMi的光谱轨道

A Spectroscopic Orbit for the late-type Be star $β$ CMi

Nick Dulaney, Noel D. Richardson, Cody J. Gerhartz, J. E. Bjorkman, K. S. Bjorkman, Alex C. Carciofi, Robert Klement, Luqian Wang, Nancy D. Morrison, Allison D.… 展开作者

Nick Dulaney, Noel D. Richardson, Cody J. Gerhartz, J. E. Bjorkman, K. S. Bjorkman, Alex C. Carciofi, Robert Klement, Luqian Wang, Nancy D. Morrison, Allison D. Bratcher, Jennifer J. Greco, Kevin K. Hardegree-Ullman, Ludwik Lembryk, Wayne L. Oswald, Jesica L. Trucks

摘要:

晚型Be星$β$ CMi与其他已被研究的Be星相比非常稳定。这导致了Klement等人的外流Be盘的现实模型。这些结果表明,该盘可能在距离恒星有限半径处被截断,Klement等人。这表明轨道上有一个看不见的双星伴星。在这里,我们报告的分析里特天文台光谱档案的$β$ CMi寻找证据的难以捉摸的同伴。我们检测到周期性多普勒频移的H $α$线的翅膀与周期为170天,振幅为2.25公里秒$^{-1}$,符合低质量的二进制伴侣($M\approx 0.42 M_\odot$)。然后,我们将紫色到红色峰高度变化($V/R$)的微小变化与轨道运动进行了比较。我们发现微弱的证据表明,它确实遵循的轨道运动,建议最近被二元模型Panoglou等人。我们的研究结果,这是类似于那些其他几个Be星,表明$β$ CMi可能是一个产品的二进制演化的罗氏叶溢出旋转了目前的Be星,可能会留下一个热的亚矮星或白矮星在围绕恒星的轨道。不幸的是,在非常有限的{ \it国际紫外线探测器}光谱档案中没有发现这颗伴星的直接迹象。

英文摘要:

The late-type Be star $β$ CMi is remarkably stable compared to other Be stars that have been studied. This has led to a realistic model of the outflowing Be disk by Klement et al. These results showed that the disk is likely truncated at a finite radius from the star, which Klement et al.~suggest is evidence for an unseen binary companion in orbit. Here we report on an analysis of the Ritter Observatory spectroscopic archive of $β$ CMi to search for evidence of the elusive companion. We detect periodic Doppler shifts in the wings of the H$α$ line with a period of 170 d and an amplitude of 2.25 km s$^{-1}$, consistent with a low-mass binary companion ($M\approx 0.42 M_\odot$). We then compared the small changes in the violet-to-red peak height changes ($V/R$) with the orbital motion. We find weak evidence that it does follow the orbital motion, as suggested by recent Be binary models by Panoglou et al. Our results, which are similar to those for several other Be stars, suggest that $β$ CMi may be a product of binary evolution where Roche lobe overflow has spun up the current Be star, likely leaving a hot subdwarf or white dwarf in orbit around the star. Unfortunately, no direct sign of this companion star is found in the very limited archive of {\it International Ultraviolet Explorer} spectra.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑