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

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