论文标题
在58中，重生喷射的光谱变化
Spectral variability of the born-again ejecta in A 58
论文作者
论文摘要
重生的行星星云（PNE）允许研究人类时间表中的恒星进化，尘埃产生和雾状冲击。在这里，我们介绍了对v605 AQL周围出生的PN A 58的多上观光光谱观测的分析，该观察在V605 AQL附近，该观察大约一个世纪前经历了非常晚的热脉冲（VLTP）。在1996年至2021年，在考虑的时间段内，H缺陷型弹出经历了相当大的亮度，许多排放线比也有显着变化。射出稀释引起的灭绝的还原和中央恒星的电离光子通量的增加似乎都无法产生这些光谱变化，而是归因于双极H poor H-poor流出分离分子材料中的冲击，并通过外部的nebula传播。
Born-again planetary nebulae (PNe) allow investigating stellar evolution, dust production, and nebular shocks in human timescales. Here we present an analysis of multi-epoch optical spectroscopic observations of the born-again PN A 58 around V605 Aql, which experienced a very late thermal pulse (VLTP) about a century ago. The H-deficient ejecta has experienced a considerable brightening in the time period considered, from 1996 to 2021, with notable changes also in many emission line ratios. Neither the reduction of the extinction caused by the dilution of the ejecta nor the increase of the ionizing photon flux from the central star seem capable to produce these spectral changes, which are instead attributed to shocks in the bipolar H-poor outflow dissociating molecular material and propagating through the outer nebula.
