000004082 001__ 4082
000004082 005__ 20200129155938.0
000004082 0247_ $$2DOI$$a10.3847/2041-8213/ab095f
000004082 037__ $$aSCART-2019-0125
000004082 100__ $$aHandler, G.
000004082 245__ $$aAsteroseismology of massive stars with the TESS mission: the runaway β Cep pulsator PHL 346 = HN Aqr
000004082 260__ $$c2019
000004082 520__ $$aWe report an analysis of the first known β Cep pulsator observed by the TESS mission, the runaway star PHL 346 = HN Aqr. The star, previously known as a singly-periodic pulsator, has at least 34 oscillation modes excited, 12 of those in the g-mode domain and 22 p modes. Analysis of archival data implies that the amplitude and frequency of the dominant mode and the stellar radial velocity were variable over time. A binary nature would be inconsistent with the inferred ejection velocity from the Galactic disc of 420 km s −1 , which is too large to be survivable by a runaway binary system. A kinematic analysis of the star results in an age constraint (23 ± 1 Myr) that can be imposed on asteroseismic modelling and that can be used to remove degeneracies in the modelling process. Our attempts to match the excitation of the observed frequency spectrum resulted in pulsation models that were too young. Hence, asteroseismic studies of runaway pulsators can become vital not only in tracing the evolutionary history of such objects, but to understand the interior structure of massive stars in general. TESS is now opening up these stars for detailed asteroseismic investigation.
000004082 594__ $$aNO
000004082 6531_ $$astars: early-type
000004082 6531_ $$astars: individual (HN Aqr)
000004082 6531_ $$astars: interiors
000004082 6531_ $$astars: kinematics and dynamics
000004082 6531_ $$astars: massive
000004082 6531_ $$astars: oscillations (including pulsations)
000004082 700__ $$aPigulski, A.
000004082 700__ $$aDaszyńska-Daszkiewicz, J.
000004082 700__ $$aIrrgang, A.
000004082 700__ $$aKilkenny, D.
000004082 700__ $$aGuo, Z.
000004082 700__ $$aPrzybilla, N.
000004082 700__ $$aKahraman Aliçavus, F.
000004082 700__ $$aKallinger, T.
000004082 700__ $$aPascual-Granado, J.
000004082 700__ $$aNiemczura, E.
000004082 700__ $$aRóżański, T.
000004082 700__ $$aChowdhury, S.
000004082 700__ $$aBuzasi, D.L.
000004082 700__ $$aMirouh, G.M.
000004082 700__ $$aBowman, D.M.
000004082 700__ $$aJohnston, C.
000004082 700__ $$aPedersen, M.
000004082 700__ $$aSimón-Díaz, S.
000004082 700__ $$aMoravveji, E.
000004082 700__ $$aGazeas, K.
000004082 700__ $$aDe Cat, P.
000004082 700__ $$aVanderspek, R.K.
000004082 700__ $$aRicker, G.R.
000004082 773__ $$c1-7$$nL4$$pAstrophysical Journal Letters$$v873
000004082 8560_ $$fpeter.decat@observatoire.be
000004082 905__ $$apublished in
000004082 980__ $$aREFERD