论文标题
FG SGE：2019年新的多色光度法和短期灰尘壳清除
FG Sge: new multicolor photometry and short-term dust shell clearing in 2019
论文作者
论文摘要
我们介绍了FG SGE的长期光度研究的新阶段的结果，该研究是行星星云1-5的快速发展的中央恒星。我们在2008 - 2021年和2013 - 2021年在光学（$ bvr_ci_c $）和红外（$ jhklm $）区域的SAI MSU望远镜上进行的新观察结果，分别使我们允许我们追踪近年来恒星亮度的演变。最重要的观察结果是在2019年进行的，当时这颗星星对灰尘壳进行了短暂的清理，并在$ bvr_c $中看到了。基于FG SGE在0.4-5 $ $ m波长范围内的光谱能分布，我们得出了灰尘壳参数：灰尘粒的大小$ a =0.01μ$ m，内部半径温度$ t _ {\ text {dust dust {dust {dust} = 900 $ k，可观的深度（k）= 0.5 $（$ v）= 0.5 $（$ v） $ m _ {\ text {dust}} = 7 \ cdot10^{ - 5} m _ {\ odot} $。在2019年的尘埃壳短期清除后，弹出了另一种尘埃结构，从而导致所有观察到的带中的恒星逐渐消失。根据IR亮度和颜色曲线，我们估计了2019 - 2020年的尘埃深度增长。
We present the results of a new stage of the long-term photometric study of FG Sge which is a quickly evolving central star of the planetary nebula Hen 1-5. Our new observations carried out on the SAI MSU telescopes in the optical ($BVR_CI_C$) and infrared (IR) ($JHKLM$) regions in 2008-2021 and 2013-2021, respectively, allowed us to trace the evolution of the star's brightness in recent years. The most significant observations were performed in 2019 when the star suffered a short clearing of the dust shell and became visible in $BVR_C$. Based on the spectral energy distribution of FG Sge in the 0.4-5 $μ$m wavelength range we derived the dust shell parameters: the size of dust grains $a=0.01μ$m, the inner radius temperature $T_{\text{dust}}=900$ K, optical depth $τ(K)=0.5$ ($τ(V)=4.5$), the total mass of dust $M_{\text{dust}}=7\cdot10^{-5} M_{\odot}$. After the short-term clearing of the dust shell in 2019, another dust structure was ejected that resulted in the star fading in all the observed bands. Based on the IR brightness and color curves, we estimated the dust depth growth in 2019-2020.
