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Dwarf novae in the shortest orbital period regime: II. wz sge stars as the missing population near the period minimum

机译：最短轨道时期的矮新星：II。 wz sge星为最小周期附近的失踪人口

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摘要

WZ Sge-type dwarf novae are characterized by long recurrence times of outbursts (～ 10 yr) and short orbital periods (? 85 min). A significant part of WZ Sge stars may remain undiscovered because of low outburst activity. Recently, the observed orbital period distribution of cataclysmic variables (CVs) has changed partly because outbursts of new WZ Sge stars have been discovered routinely. Hence, estimations of the intrinsic population of WZ Sge stars are important to study the population and the evolution of CVs. In this paper, we present a Bayesian approach to estimate the intrinsic period distribution of dwarf novae from observed samples. In this Bayesian model, we assumed a simple relationship between the recurrence time and the orbital period, which is consistent with observations of WZ Sge stars and other dwarf novae. As a result, the minimum orbital period was estimated to be ～ 70 min. The population of WZ Sge stars exhibited a spike-like feature at the shortest period regime in the orbital period distribution. These features are consistent with the orbital period distribution previously predicted by population synthesis studies. We propose that WZ Sge stars and CVs with a low mass-transfer rate are excellent candidates for the missing population predicted by the evolution theory of CVs.
机译：WZ Sge型矮新星的特征是爆发的复发时间长（〜10年）和较短的轨道周期（约85分钟）。由于爆发活动低，WZ Sge的大部分恒星可能仍未被发现。近来，观测到的大地变星（CVs）的轨道周期变化已部分改变，因为常规发现了新的WZ Sge恒星爆发。因此，估算WZ Sge星的固有种群对于研究种群和CV的演化很重要。在本文中，我们提出了一种贝叶斯方法来根据观测样品估算矮新星的固有周期分布。在这个贝叶斯模型中，我们假定了复发时间和轨道周期之间的简单关系，这与WZ Sge恒星和其他矮新星的观测一致。结果，最小轨道周期估计为〜70分钟。 WZ Sge恒星的总数在轨道周期分布的最短周期内呈现出穗状特征。这些特征与先前通过人口综合研究预测的轨道周期分布是一致的。我们认为传质速率低的WZ Sge星和CV是CVs进化论所预测的缺失种群的极佳候选者。

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