论文标题
IM Normae：灾难性变量的死亡螺旋？
IM Normae: The Death Spiral of a Cataclysmic Variable?
论文作者
论文摘要
我们介绍了自2002年爆发以来复发的Nova IM型轨道光曲线的研究。宽阔的“日食”复发为2.46小时，在1.28（16）x10^6年的时间表上增加。在保守的质量转移的假设下，这表明速率接近10^-7 m_sol/年，这与我们的亮度估计值相符，与后诺瓦的估计/积聚/率一致。即时通讯似乎也与著名的复发性Nova T pyxidis紧密相匹配。这两颗恒星似乎都具有很高的吸积率，足以驱动反复发作的Nova事件。两者都有静止的光曲线，表明低质量次级的加热和非常宽的轨道最小值，这表明在初级周围有一个大型“电晕”。正如从低质量成分的高质量转移所预期的那样，两者的轨道周期都非常快。这两颗恒星可能代表了Nova的最后阶段 - 以及灾难性变化的进化，其中辐射驱动的风驱动了高传质的速度，从而在Nova爆发的阵发中蒸发了供体恒星。
We present a study of the orbital light curves of the recurrent nova IM Normae since its 2002 outburst. The broad "eclipses" recur with a 2.46 hour period, which increases on a timescale of 1.28(16)x10^6 years. Under the assumption of conservative mass-transfer, this suggests a rate near 10^-7 M_sol/year, and this agrees with the estimated /accretion/ rate of the postnova, based on our estimate of luminosity. IM Nor appears to be a close match to the famous recurrent nova T Pyxidis. Both stars appear to have very high accretion rates, sufficient to drive the recurrent-nova events. Both have quiescent light curves which suggest strong heating of the low-mass secondary, and very wide orbital minima which suggest obscuration of a large "corona" around the primary. And both have very rapid orbital period increases, as expected from a short-period binary with high mass transfer from the low-mass component. These two stars may represent a final stage of nova -- and cataclysmic-variable -- evolution, in which irradiation-driven winds drive a high rate of mass transfer, thereby evaporating the donor star in a paroxysm of nova outbursts.
