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arXiv 1111.2512astro-ph.SR
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来自SDSS的公共信封后二进制文件。XIII:轨道周期分布的质量依赖性

Post-common-envelope binaries from SDSS. XIII: Mass dependencies of the orbital period distribution

M. Zorotovic, M. R. Schreiber, B. T. Gänsicke, A. Rebassa-Mansergas, A. Nebot Gómez-Morán, J. Southworth, A. D. Schwope, S. Pyrzas, P. Rodríguez-Gil, L. Schmidt… 展开作者

M. Zorotovic, M. R. Schreiber, B. T. Gänsicke, A. Rebassa-Mansergas, A. Nebot Gómez-Morán, J. Southworth, A. D. Schwope, S. Pyrzas, P. Rodríguez-Gil, L. Schmidtobreick, R. Schwarz, C. Tappert, O. Toloza, N. Vogt

摘要:

由一颗白矮星和一颗主序星组成的后共包络双星是制约共包络演化模型的理想系统。直到最近,观测到的多氯联苯样本太小,无法充分探索这一潜力,然而,最近从斯隆数字巡天(SDSS)中发现的大而相对均匀的多氯联苯样本大大改变了这种情况。在这里,我们分析的轨道周期分布的PCEBs包含He-和C/O-核心WD分别和调查是否PCEBs的轨道周期是与其恒星组件的质量。我们进行了标准的统计测试,比较轨道周期分布,并确定可能的关系的置信水平。含He核WD的PCEB的轨道周期明显短于含C/O核WD的PCEB。虽然He核PCEB轨道周期分布的中值为Porb ~ 0.28 d,但含有C/O核WD的PCEB的中值轨道周期为Porb ~ 0.57 d。我们还发现,系统包含更多的质量secondaries有较长的后CE轨道周期,在最近的预测相矛盾。我们的观测结果提供了新的限制CE进化理论。然而,我们建议未来的二进制人口模型考虑到选择效应,仍然影响目前观察到的PCEB样本。

英文摘要:

Post-common-envelope binaries (PCEBs) consisting of a white dwarf (WD) and a main-sequence secondary star are ideal systems to constrain models of common-envelope (CE) evolution. Until very recently, observed samples of PCEBs have been too small to fully explore this potential, however the recently identified large and relatively homogenous sample of PCEBs from the Sloan Digital Sky Survey (SDSS) has significantly changed this situation. We here analyze the orbital period distributions of PCEBs containing He- and C/O-core WDs separately and investigate whether the orbital period of PCEBs is related to the masses of their stellar components. We performed standard statistical tests to compare the orbital period distributions and to determine the confidence levels of possible relations. The orbital periods of PCEBs containing He-core WDs are significantly shorter than those of PCEBs containing C/O-core WDs. While the He-core PCEB orbital period distribution has a median value of Porb ~ 0.28 d, the median orbital period for PCEBs containing C/O-core WDs is Porb ~ 0.57 d. We also find that systems containing more massive secondaries have longer post-CE orbital periods, in contradiction to recent predictions. Our observational results provide new constraints on theories of CE evolution. However we suggest future binary population models to take selection effects into account that still affect the current observed PCEB sample.

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