论文标题
NOVA V5668 SGR的光学和NIR数据以及建模
Optical and NIR data and modelling of nova V5668 Sgr
论文作者
论文摘要
我们提出了HST光学图像，Keck-Osiris NIR IFS数据立方体和2016年至2019年Nova V5668 SGR的Keck-Nirc2 Nirc2 Nirc2 NIRM图像。观测表明，低电离线的极性盖和赤道旋转的发射增强，并且仅在极性盖上增强的高电离发射线。径向速度与V = 590 km S $^{ - 1} $的均匀膨胀速度兼容，并且系统倾斜角为24 $^o $。这些值用于估计膨胀差距为1200 $ \ pm $ 400 pc。 NIRC2数据表明在2016年和2017年存在灰尘，但在2019年无法检测到灰尘发射。观察数据用于组装喷射的3D光电离模型。该模型结果表明，中心来源的温度为$ 1.88 \ times10^{5} $ k，$ 1.6 \ times10^{35} $ erg s $^{ - 1} $在2017年8月（爆发后2.4年）的温度为$ 1.6 \ times10^{35}。这些模型还暗示了电离通量的各向异性，这可能是由于发光振动盘的贡献。
We present HST optical images, Keck-OSIRIS NIR IFS data cubes and Keck-NIRC2 NIR images of nova V5668 Sgr from 2016 to 2019. The observations indicate enhanced emission at the polar caps and equatorial torus for low ionization lines, and enhanced high ionization emission lines only at the polar caps. The radial velocities are compatible with a homogeneous expansion velocity of v=590 km s$^{-1}$ and a system inclination angle of 24$^o$. These values were used to estimate an expansion parallax distance of 1200 $\pm$ 400 pc. The NIRC2 data indicate the presence of dust in 2016 and 2017, but no dust emission could be detected in 2019. The observational data were used for assembling 3D photoionization models of the ejecta. The model results indicate that the central source has a temperature of $1.88\times10^{5}$ K and a luminosity of $1.6\times10^{35}$ erg s$^{-1}$ in August of 2017 (2.4 years post eruption), and that the shell has a mass of $6.3\times10^{-5}$ M$_{\odot}$. The models also suggest an anisotropy of the ionizing flux, possibly by the contribution from a luminous accretion disc.
