南方后新星的SALT观测
SALT observations of southern post-novae
摘要：
我们报告最近的光学观测的恒星和星云残余的22个南部后新星。在这项研究中，对于我们的每一个目标，我们获得并分析了长缝光谱在光谱范围3500-6600 A和H $α$ +NII窄带图像。自爆发以来，发射线的等效宽度随时间的变化与其他作者的早期发表的结果一致。我们估计平均值$α$ =2.37的幂律指数拟合后新星连续。我们的观测清楚地显示了V842 Cen膨胀星云的双组分结构，这是由于喷射物质的速度不同。我们在V382 Vel周围发现了一个外直径约为12角秒的膨胀壳。
英文摘要：
We report on recent optical observations of the stellar and the nebular remnants of 22 southern post-novae. In this study, for each of our targets, we obtained and analysed long-slit spectra in the spectral range 3500-6600 A and in H$α$+NII narrow-band images. The changes in the emission lines' equivalent widths with the time since the outburst agree with earlier published results of other authors. We estimated an average value $α$=2.37 for the exponent of the power law fitted to the post-novae continua. Our observations clearly show the two-component structure of the V842 Cen expanding nebulae, owing to the different velocities of the ejected matter. We discovered an expanding shell around V382 Vel with an outer diameter of about 12 arcsec.
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