从SDSS - III发布公用信封二进制文件。七个新的轨道周期
Post Common Envelope Binaries from SDSS - III. Seven new orbital periods
摘要：
我们提出了后续的光谱学和光度学的11后共同信封二（PCEB）的候选人确定从多个斯隆数字巡天（SDSS）光谱在早期的文件。使用\Lines{Na}{I}{8183.27,8194.81}吸收双峰对其中9个系统进行了径向速度测量，并提供了$\Porb= 2.7-17.4$ h范围内6个轨道周期的测量结果。三个PCEB候选人没有表现出显着的径向速度变化在后续数据中，我们讨论了单独使用SDSS光谱识别PCEB的影响。差示光度法证实了我们的一个光谱轨道周期，并提供了一个额外的\Porb测量。估计的二元参数的七个对象，我们已经测量了轨道周期和径向速度振幅的低质量伴星，$K_\mathrm{sec}$。到目前为止，我们已经公布了9个SDSS PCEB轨道周期，它们都是$\Porb<1$ d。我们进行Monte-Carlo模拟，并表明，$3σ$ SDSS径向速度的变化仍然应该是可检测的系统在轨道周期范围内的$\Porb\sim1-10$天。因此，我们的研究结果表明，PCEB的数量显着减少$\Porb>1$天，在共同的信封阶段的双星的轨道能量可能是不太有效地用于驱逐信封比经常假设。
英文摘要：
We present follow-up spectroscopy and photometry of 11 post common envelope binary (PCEB) candidates identified from multiple Sloan Digital Sky Survey (SDSS) spectroscopy in an earlier paper. Radial velocity measurements using the \Lines{Na}{I}{8183.27,8194.81} absorption doublet were performed for nine of these systems and provided measurements of six orbital periods in the range $\Porb= 2.7-17.4$ h. Three PCEB candidates did not show significant radial velocity variations in the follow-up data, and we discuss the implications for the use of SDSS spectroscopy alone to identify PCEBs. Differential photometry confirmed one of our spectroscopic orbital periods and provided one additional \Porb measurement. Binary parameters are estimated for the seven objects for which we have measured the orbital period and the radial velocity amplitude of the low-mass companion star, $K_\mathrm{sec}$. So far, we have published nine SDSS PCEBs orbital periods, all of them $\Porb<1$ d. We perform Monte-Carlo simulations and show that $3σ$ SDSS radial velocity variations should still be detectable for systems in the orbital period range of $\Porb\sim1-10$ days. Consequently, our results suggest that the number of PCEBs decreases considerably for $\Porb>1$ day, and that during the common envelope phase the orbital energy of the binary star is maybe less efficiently used to expell the envelope than frequently assumed.
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