论文标题
一项关于IAX类型恒星残留物及其与SN 1181的可能关联的新研究
A new study on a type Iax stellar remnant and its probable association with SN 1181
论文作者
论文摘要
我们报告了恒星残留物的观察和建模和假定的〜IAX超新星PA30型的双层合并，这是Sn〜1181〜AD的可能残留物。这是唯一已知的界限SN残留物，也是唯一具有狼射线特征的恒星，它既不是行星星云中央恒星，也不是巨大的流行I祖先。我们将独特的发射线频谱对宽，强的O〜 {\ sc vi}和O〜 {\ sc viii}线进行建模，作为快速恒星风和震惊的热气体。非LTE风模型表示$ \ sim 10^{ - 6} \，\ rm m_ \ odot \，yr^{ - 1} $的质量损失率和$ \ sim $ 15,000〜 km \，s $^{ - 1} $的终端速度与早期结果一致。 o〜 {\ sc viii}线表示$ t \ simeq 4 \，$ mk的震惊气体温度。我们得出了$ b <2.5 \，$ mg的磁场上限，低于早期的建议。亮度表示残余质量为1.0---1.65 \，\ rm m $ _ \ odot $，带有弹出质量$ 0.15 \ pm0.05 \，\ rm m_ \ odot $。档案光度法表明，在100年内，恒星残留物使$ \ sim $ 0.5幅度变暗。低NE/O $ \，<0.15 $与合并中的O-NE白矮人争论。冷尘壳只是SN IAX和第一个冷尘中的灰尘的第二次检测。我们的射水质量和残留物的动能估计与IAX型外乳层源一致。
We report observations and modeling of the stellar remnant and presumed double-degenerate merger of Type~Iax supernova Pa30, which is the probable remnant of SN~1181~AD. It is the only known bound stellar SN remnant and the only star with Wolf-Rayet features that is neither a planetary nebula central star nor a massive Pop I progenitor. We model the unique emission-line spectrum with broad, strong O~{\sc vi} and O~{\sc viii} lines as a fast stellar wind and shocked, hot gas. Non-LTE wind modeling indicates a mass-loss rate of $\sim 10^{-6}\,\rm M_\odot\,yr^{-1}$ and a terminal velocity of $ \sim$15,000~km\,s$^{-1}$, consistent with earlier results. O~{\sc viii} lines indicate shocked gas temperatures of $T \simeq 4\,$MK. We derive a magnetic field upper limit of $B<2.5\,$MG, below earlier suggestions. The luminosity indicates a remnant mass of 1.0--1.65\,\rm M$_\odot$ with ejecta mass $0.15\pm0.05\,\rm M_\odot$. Archival photometry suggests the stellar remnant has dimmed by $\sim$0.5 magnitudes over 100 years. A low Ne/O$\,<0.15$ argues against a O-Ne white dwarf in the merger. A cold dust shell is only the second detection of dust in a SN Iax and the first of cold dust. Our ejecta mass and kinetic energy estimates of the remnant are consistent with Type Iax extragalactic sources.
