最快经典新星V1674 Her的研究：光致电离与形态-动力学模型分析
Study of the fastest classical nova, V1674 Her: Photoionization and Morpho-kinemetic model analysis
AI总结：
本研究调查了最快经典新星V1674 Her，利用光致电离代码和形态-动力学建模分析了其爆发后的物理化学参数、罕见的Fe与He/N混合转变及双极结构。
摘要：
我们展示了对新星V1674 Her（2021）的调查结果，该新星被公认为最快的经典新星，其$t_2 \sim 0.90$天。该新星的距离估计为4.97 kpc。WD（白矮星）的质量和半径分别计算为$\sim~1.36~M_\odot$和$\sim 0.15~R_\oplus$。在爆发后的一个月内，V1674 Her经历了不同的阶段——峰前、早期下降、星云和日冕——显示出极其迅速的转变。星云线在第10.00天出现，使其成为迄今为止观测到最早开始星云阶段的经典新星。我们使用光致电离代码\textsc{cloudy}对观测到的光学光谱进行了建模。从最佳拟合模型中，我们推导出与该系统相关的不同物理和化学参数。中心电离源的温度和光度分别在$1.99 - 2.34~\times 10^5$ K和$1.26 - 3.16~ \times 10^{38}$ \ergs范围内。发现在星云和日冕阶段，He、O、N和Ne等元素与太阳丰度相比均过度丰富。根据模型，Fe II丰度减少而Ne丰度增加，这可能解释了Fe和He/N新星类别之间罕见的混合转变。所有时期的抛射质量范围为$3.42 - 7.04~ \times 10^{-5}~M_\odot$。利用\textsc{shape}进行的形态-动力学建模显示，新星V1674 Her具有双极结构，中心有赤道环，倾角为i = 67$\pm$ 1.5$^{\circ}$。
英文摘要：
We present the results of the investigation of the nova V1674 Her (2021), recognised as the swiftest classical nova, with $t_2 \sim 0.90$ days. The distance to the nova is estimated to be 4.97 kpc. The mass and radius of the WD are calculated to be $\sim~1.36~M_\odot$ and $\sim 0.15~R_\oplus$, respectively. Over the course of one month following the outburst, V1674 Her traversed distinct phases -- pre-maxima, early decline, nebular, and coronal -- displaying a remarkably swift transformation. The nebular lines emerged on day 10.00, making it the classical nova with the earliest observed commencement to date. We modelled the observed optical spectrum using the photoionization code \textsc{cloudy}. From the best-fitting model we deduced different physical and chemical parameters associated withe the system. The temperature and luminosity of the central ionizing sources are found in the range of $1.99 - 2.34~\times 10^5$ K and $1.26 - 3.16~ \times 10^{38}$ \ergs, respectively. Elements such as He, O, N, and Ne are found to be overabundant compared to solar abundance in both the nebular and coronal phases. According to the model, Fe II abundance diminishes while Ne abundance increases, potentially elucidating the rare hybrid transition between Fe and He/N nova classes. The ejected mass across all epochs spanned from $3.42 - 7.04~ \times 10^{-5}~M_\odot$. Morpho-kinematic modelling utilising \textsc{shape} revealed that the nova V1674 Her possesses a bipolar structure with an equatorial ring at the centre and an inclination angle of i = 67$\pm$ 1.5$^{\circ}$.
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。
