来自爱丁堡-开普蓝天体巡天的三个灾变前变星的观测
Observations of three pre-cataclysmic variables from the Edinburgh-Cape Blue Object Survey
摘要：
我们目前的光变曲线和时间分辨光谱的三个候选人前激变双星EC 12477-1738，EC 13349-3237，和EC 14329-1625。我们确定EC 12477-1738的轨道周期为0.362 d，从而证实了先前报道的值。EC 14329-1625也有类似的周期，P=0.350 d。这两个系统都包含一颗中等温度的白矮星（T = 15000-20000 K）和一颗M3 V二级恒星。第三个前CV，EC 13349-3237，是三个中最年轻的，具有热WD（T ~ 35000 K），也具有最长的周期P=0.469 d。此外，它也是一颗罕见的前CV，拥有一颗相对较早的M1 V型副恒星，最终会在周期间隔以上演化成CV。
英文摘要：
We present light curves and time-resolved spectroscopy of the three candidate pre-cataclysmic binaries EC 12477-1738, EC 13349-3237, and EC 14329-1625. We determine the orbital period for EC 12477-1738 as 0.362 d, thus confirming the value previously reported. A similar period, P=0.350 d, is found for EC 14329-1625. Both systems incorporate a medium-hot white dwarf (T = 15000-20000 K) and an M3V secondary star. The third pre-CV, EC 13349-3237, is the youngest of the three, with a hot WD (T ~ 35000 K), and it also has the longest period P=0.469 d. It furthermore turns out to be one of the still rare pre-CVs with a comparatively early-type, M1V, secondary star, which will eventually evolve into a CV above the period gap.
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