论文标题
RS OPH双极喷射的无线电干涉成像2021 NOVA爆发
Radio interferometric imaging of RS Oph bipolar ejecta for the 2021 nova outburst
论文作者
论文摘要
复发性的Nova和共生二进制RS OPH在2021年8月再次爆发，以获得第八次爆发。作为一项多个上述和频率运动的一部分，我们在5 GHz爆发后与欧洲VLBI网络（EVN）爆发后34天观察了RS OPH。在东西方向上伸长了无线电图像，总延伸约90个MAS（或Gaia dr3距离为240个AU d = 2.68 [-0.15/+0.17 kpc），并且显示出明亮而紧凑的中心成分与Gaia Astormets的位置相吻合，并且两个Lobes East和East the It It It It eTerbentimort to orbendimort to orbendimort to orbendimort to orbendimort to orbendimort ofbendimort to orbendimort。通过与光谱上的发射线轮廓的演化进行比较，我们发现叶的前缘以7550 km/s的速度扩展，而i = 54 ver作为二进制的轨道倾斜度。 2021射线结构与2006年喷发后观察到的无线电结构非常相似。讨论了密度增强在轨道平面（DEOP）上的遮盖作用，与DEOP背景中回收叶的时间有关的可见性进行了讨论，三尖峰曲线的起源可追溯到由nova ejecta形成的环结构，影响了deop。
The recurrent nova and symbiotic binary RS Oph erupted again in August 2021 for its eighth known outburst. As part of a multi-epoch and frequency campaign, we observed RS Oph 34 days after the outburst at 5 GHz with the European VLBI Network (EVN). The radio image is elongated over the east-west direction for a total extension of about 90 mas (or about 240 AU at the Gaia DR3 distance d=2.68 [-0.15/+0.17] kpc), and shows a bright and compact central component coincident with the Gaia astrometric position, and two lobes east and west of it, expanding perpendicular to the orbital plane. By comparing with the evolution of emission-line profiles on optical spectra, we found the leading edge of the lobes to be expanding at 7550 km/s, and i=54 deg as the orbital inclination of the binary. The 2021 radio structure is remarkably similar to that observed following the 2006 eruption. The obscuring role of the density enhancement on the orbital plane (DEOP) is discussed in connection to the time-dependent visibility of the receding lobe in the background to the DEOP, and the origin of the triple-peaked profiles is traced to the ring structure formed by the nova ejecta impacting the DEOP.
