论文标题
经典NOVA ASASSN-18FV的射出的光谱和几何演化
Spectroscopic and geometrical evolution of the ejecta of the classical nova ASASSN-18fv
论文作者
论文摘要
提出了从2018年3月24日至2019年1月26日观察到的ASASSN-18FV的光谱观察结果。光谱从Mirranook，Vainu Bappu和南非天文观测器获得。该光谱在早期阶段的氢Balmer，Fe II和O I线中以P-Cygni曲线为主导，这是Fe II类Nova的典型代表。光谱显示他与h i和o发射线在下降阶段排成一列，将Nova放置在Novae的混合类中。在此阶段，光谱显示出高电离线的快速发展。光曲线的分析表示T $ _2 $和T $ _3 $的值分别为50天和70天，将NOVA放置在中等快速的NOVA类别中。使用形态基因分析估算射流几何形状，倾斜度和位置角度。发现射出的几何形状是一种不对称的双极结构，其倾斜角约为53 $^{\ circ} $。发现使用照片离子化分析的弹出质量为6.07 $ \ times $ 10 $^{ - 4} $ M $ _ {\ odot} $。
The optical spectroscopic observations of ASASSN-18fv observed from 2018 March 24 to 2019 Jan 26 are presented. The optical spectra are obtained from Mirranook, Vainu Bappu and South African Astronomical observatories. The spectra are dominated by hydrogen Balmer, Fe II and O I lines with P-Cygni profiles in the early phase, typical of an Fe II class nova. The spectra show He I lines along with H I and O I emission lines in the decline phase placing the nova in the hybrid class of novae. The spectra show rapid development in high ionization lines in this phase. Analysis of the light curve indicate t$_2$ and t$_3$ values of about 50 and 70 days respectively placing the nova in the category of moderately fast nova. The ejecta geometry, inclination and position angle are estimated using morpho-kinematic analysis. The geometry of the ejecta is found to be an asymmetric bipolar structure with an inclination angle of about 53$^{\circ}$. The ejected mass using photo-ionization analysis is found to be 6.07 $\times$ 10$^{-4}$ M$_{\odot}$.
