银河系周期性新星T Pyxtae、IM Normae和CI Aquilae的缓慢衰退
The slow decline of the Galactic recurrent novae T Pyxidis, IM Normae, and CI Aquilae
摘要：
银河系中已知的三颗轨道周期最短的复发新星T Pyx、IM Nor和CI Aql的一个显著特征是，它们的光衰时间尺度明显长于其他复发系统。另一方面，一些估计的喷出物的质量，喷出物的速度，和这些系统的软X射线发射的持续时间的顺序的其他经常性的系统和快速的经典新星。我们对这一现象提出了初步的解释。我们认为，在这些系统中，在喷发的最初几天从伴星转移的部分物质保留在白矮星的洛希瓣内，防止辐射电离系统的喷出物，并增加光学下降的时间尺度。我们解释了为什么这种现象更可能在具有高质量传递速率和短轨道周期的系统中。最后，我们提出了一个示意性的模型，表明从伴星转移的物质足以吸收这些系统中的白矮星的辐射，最终支持这种情况下定量现实。
英文摘要：
A distinguishing trait of the three known Galactic recurrent novae with the shortest orbital periods, T Pyx, IM Nor, and CI Aql, is that their optical decline time-scales are significantly longer than those of the other recurrent systems. On the other hand, some estimates of the mass of the ejecta, the velocity of the ejecta, and the duration of the soft X-rays emission of these systems are of the order of those of the other recurrent systems and the fast classical novae. We put forth a tentative explanation of this phenomenon. We propose that in these systems part of the material transferred from the companion during the first few days of the eruption remains within the Roche lobe of the white dwarf, preventing the radiation from ionizing the ejecta of the system and increasing the optical decline time-scale. We explain why this phenomenon is more likely in systems with a high mass transfer rate and a short orbital period. Finally, we present a schematic model that shows that the material transferred from the companion is sufficient to absorb the radiation from the white dwarf in these systems, ultimately supporting this scenario as quantitatively realistic.
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