新星遗迹FH Ser的VLT VIMOS积分场光谱学研究
VLT VIMOS Integral Field Spectroscopy of the nova remnant FH Ser
AI总结：
本研究利用VLT VIMOS积分场光谱观测揭示新星遗迹FH Ser的3D空间运动学结构，发现其由倾斜长椭球形壳和环状结构组成，评估了质量和动能，为探究其早期成形效应提供依据。
摘要：
FH Ser于1970年2月经历了一次缓慢的经典新星爆发，这是首次在紫外、光学和红外波长下观测到的新星爆发。其新星遗迹呈椭圆形，具有多个结点，沿短轴有一个特殊的环状纤维结构。本研究旨在通过VLT VIMOS积分场光谱观测揭示其真实的3D空间运动学结构，以探究早期成形效应并评估其质量和动能。通过3D可视化分析数据立方，揭示了不同的结构成分：FH Ser由一个倾斜的长椭球形壳（在H-alpha中最显著）和一个环状结构（在[N II]中最显著）组成。椭球形壳的赤道速度和极速度分别为505 km/s和630 km/s，其长轴相对于视线倾斜52度。环的对称轴倾角相似，即它可被描述为主椭球形壳的赤道带。电离质量为2.6×10⁻⁴太阳质量，动能为1.6×10⁴⁵尔格。FH Ser中两个方向相似的不同结构成分可能与沿某一平面（极可能是新星事件时的轨道平面）的密度增强有关。获取新星遗迹的积分场光谱观测对于区分不同结构成分和评估其3D物理结构至关重要。
英文摘要：
FH Ser experienced a slow classical nova outburst in February 1970 that was the first one observed at UV, optical, and IR wavelengths. Its nova remnant is elliptical in shape, with multiple knots, and a peculiar ring-like filament along its minor axis. This work aims at unveiling its true 3D spatio-kinematical structure to investigate the effects of early shaping and to assess its mass and kinetic energy using VLT VIMOS integral field spectroscopic observations. The data cube has been analyzed using 3D visualisations that reveal different structural components. FH Ser consists of a tilted prolate ellisoidal shell, most prominent in H-alpha, and a ring-like structure, most prominent in [N II]. The ellipsoidal shell has equatorial and polar velocities of 505 and 630 km/s, respectively, with its major axis tilted by 52 deg with respect to the line of sight. The inclination angle of the symmetry axis of the ring is similar, i.e., it can be described as an equatorial belt of the main ellipsoidal shell. The ionized mass is 2.6E-4 solar mass, with a kinetic energy of 1.6E45 erg. The presence of two different structural components in FH Ser with similar orientation can be linked to a density enhancement along a plane, most likely the orbital plane at the time of the nova event. The acquisition of integral field spectroscopic observations of nova remnants is most required to disentangle different structural components and to assess their 3D physical structure.
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