论文标题
早期富含氮的狼射线星WR7的多变异时间尺度
Multiple variability time-scales of the early nitrogen-rich Wolf-Rayet star WR7
论文作者
论文摘要
我们介绍了早期，富含氮的狼射线（WR）星的光学变异性的分析。多扇区过渡系系外行星卫星（TESS）光曲线和高分辨率光谱观测的分析证实了对年度时间表的多周期变异性。除了先前报道的第7区的高频功能外，我们在苔丝行业33和34光曲线中检测到$ 2.6433 \ pm 0.0005 $ d的主要时期。我们讨论了可能导致WR7的合理机制，包括WR7的这种可变性，包括脉动，双核，双线性相互作用的区域（Coottectections conterace coots Internocient winds）和克洛姆（Clots Clotections Intervotient）（Clumpys）和Clumpys）（Clumpys））。鉴于缺乏出现恒星或紧凑型伴侣的有力证据，我们建议WR7除了在随机低频可变性之上引起的CIR可能引起的风变化外，可能会在准连续模式下进行脉动。 WR7无疑是在光谱和光度法中进行未来监测的值得的目标，可以对短（$ \ lyssim 1 $ d）和长（$ \ gtrsim 1000 $ d）进行可变性时间尺度进行采样。
We present the analysis of the optical variability of the early, nitrogen-rich Wolf-Rayet (WR) star WR7. The analysis of multi-sector Transiting Exoplanet Survey Satellite (TESS) light curves and high-resolution spectroscopic observations confirm multi-periodic variability that is modulated on time-scales of years. We detect a dominant period of $2.6433 \pm 0.0005$ d in the TESS sectors 33 and 34 light curves in addition to the previously reported high-frequency features from sector 7. We discuss the plausible mechanisms that may be responsible for such variability in WR7, including pulsations, binarity, co-rotating interacting regions (CIRs) and clumpy winds. Given the lack of strong evidence for the presence of a stellar or compact companion, we suggest that WR7 may pulsate in quasi-coherent modes in addition to wind variability likely caused by CIRs on top of stochastic low-frequency variability. WR7 is certainly a worthy target for future monitoring in both spectroscopy and photometry to sample both the short ($\lesssim 1$ d) and long ($\gtrsim 1000$ d) variability time scales.
