论文标题
在高质量X射线二进制中寻找供体星脉冲的苔丝搜索
A TESS search for donor-star pulsations in High-Mass X-ray Binaries
论文作者
论文摘要
高质量X射线二进制（HMXB）对应物的地面光学测定法显示，在〜0.3-0.5 d的时间尺度上存在周期性调制。最新的基于空间的观测值和恒星的corot和苔丝表明，由P和G模式引起的脉动在早期类型的恒星中很常见。因此，我们已经在23个HMXB的光学对应物（主要是中子星系，但包括一个黑洞，Cyg X-1）的光学对应物中进行了系统的搜索，主要使用苔丝数据主要以2分钟的节奏模式。在删除了四个系统中的轨道周期调制后，我们发现所有23个来源都显示出短于〜1 d的时期的准周期可变性的证据。我们将它们的功率谱与观察到其他OB和型恒星的功率光谱进行了比较。在两个系统中，V725 Tau和HD 249179（可能不是HMXB），我们找到了爆发的证据，前者同时发生X射线耀斑。我们在爆发期间搜索功率谱的变化，并将它们与其他BE系统中看到的爆发进行比较。
Ground-based optical photometry of the counterparts of High-Mass X-ray Binaries (HMXBs) has revealed the presence of periodic modulations on timescales of ~0.3-0.5 d. More recent space-based observations Corot and TESS of OB and Be stars have shown that pulsations caused by p and g modes are common in early type stars. We have therefore undertaken a systematic search for variability in the optical counterparts of 23 HMXBs (mostly neutron star systems, but including one black hole, Cyg X-1) using TESS data primarily in 2 min cadence mode. After removing the orbital period modulation in four systems, we find that all 23 sources show evidence for quasi-periodic variability on periods shorter than ~1 d. We compare their power spectra with those from observations of other OB and Be type stars. In two systems, V725 Tau and HD 249179 (which may not be a HMXB), we find evidence for an outburst, the former being simultaneous with an X-ray flare. We search for changes in the power spectra over the outburst duration, and compare them with outbursts seen in other Be systems.
