标题： 大质量恒星的星震学研究：TESS任务中的逃逸Beta Cep脉动体PHL 346 = HN Aqr 显示英文标题

标题： Asteroseismology of massive stars with the TESS mission: the runaway Beta Cep pulsator PHL 346 = HN Aqr

摘要： 我们报告了对TESS任务观测到的第一个已知的Beta Cep pulsator，即逃逸星PHL 346 = HN Aqr的分析。这颗恒星之前被认为是一个单周期脉动体，至少激发了34个振荡模式，其中12个在g模式域，22个是p模式。档案数据的分析表明，主模式的振幅和频率以及恒星的径向速度随时间变化。双星性质与从银河系盘中推断出的420 km/s的抛射速度不一致，这个速度太大，无法被逃逸双星系统存活。对该恒星的动力学分析得出一个年龄约束（23 ± 1 Myr），可以施加于星震建模，并可用于消除建模过程中的退化问题。我们尝试匹配观测到的频率谱的激发，得到了过于年轻的脉动模型。因此，对逃逸脉动体的星震研究不仅在追踪这类物体的演化历史方面至关重要，而且有助于理解大质量恒星的一般内部结构。TESS现在正在为这些恒星提供详细的星震学研究机会。 显示英文摘要

摘要： We report an analysis of the first known Beta Cep pulsator observed by the TESS mission, the runaway star PHL 346 = HN Aqr. The star, previously known as a singly-periodic pulsator, has at least 34 oscillation modes excited, 12 of those in the g-mode domain and 22 p modes. Analysis of archival data implies that the amplitude and frequency of the dominant mode and the stellar radial velocity were variable over time. A binary nature would be inconsistent with the inferred ejection velocity from the Galactic disc of 420 km/s, which is too large to be survivable by a runaway binary system. A kinematic analysis of the star results in an age constraint (23 +- 1 Myr) that can be imposed on asteroseismic modelling and that can be used to remove degeneracies in the modelling process. Our attempts to match the excitation of the observed frequency spectrum resulted in pulsation models that were too young. Hence, asteroseismic studies of runaway pulsators can become vital not only in tracing the evolutionary history of such objects, but to understand the interior structure of massive stars in general. TESS is now opening up these stars for detailed asteroseismic investigation.