We examine high-cadence space photometry taken by the Transiting Exoplanet Survey Satellite (TESS) of a sample of evolved massive stars: 26 Wolf–Rayet stars (WRs) and eight luminous blue variables (LBVs) or candidate LBVs. To avoid confusion problems, only stars without bright Gaia neighbours and without evidence of bound companions are considered. This leads to a clean sample, the variability properties of which should truly reflect the properties of the WR and LBV classes. Red noise is detected in all cases and its fitting reveals characteristics very similar to those found for OB stars. Coherent variability is also detected for 20 per cent of the WR sample. Most detections occur at moderately high frequency (3–14 d−1), hence they are most probably linked to pulsational activity. This work doubles the number of WRs known to exhibit high-frequency signals.

中文翻译：

---

演化大质量恒星中的红噪声和脉动

我们检查了由凌日系外行星调查卫星 (TESS) 对演化的大质量恒星样本进行的高节奏空间光度测量：26 颗沃尔夫-拉叶星 (WR) 和 8 个发光蓝色变量 (LBV) 或候选 LBV。为了避免混淆问题，只考虑没有明亮的 Gaia 邻居和没有绑定同伴证据的恒星。这会产生一个干净的样本，其可变性属性应该真正反映 WR 和 LBV 类的属性。在所有情况下都检测到红噪声，其拟合显示出与 OB 恒星非常相似的特征。20% 的 WR 样本也检测到相干变异性。大多数检测发生在中等高频率（3-14 d-1），因此它们很可能与脉动活动有关。