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Asteroseismology of Massive Stars with the TESS Mission: The Runaway β Cep Pulsator PHL 346 = HN Aqr

Handler, Gerald, Pigulski, Andrzej, Daszyńska-Daszkiewicz, Jadwiga, Irrgang, Andreas, Kilkenny, David, Guo, Zhao, Przybilla, Norbert, Aliçavuş, Filiz Kahraman, Kallinger, Thomas, Pascual-Granado, Javier , Niemczura, Ewa, Różański, Tomasz, Chowdhury, Sowgata, Buzasi, Derek L., Mirouh, Giovanni M., Bowman, Dominic M., Johnston, Cole, Pedersen, May G., Simón-Díaz, Sergio, Moravveji, Ehsan, Gazeas, Kosmas, De Cat, Peter, Vanderspek, Roland K. and Ricker, George R. (2019) Asteroseismology of Massive Stars with the TESS Mission: The Runaway β Cep Pulsator PHL 346 = HN Aqr The Astrophysical Journal Letters, 873 (1).

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Abstract

We report an analysis of the first known β Cep pulsator observed by the Transiting Exoplanet Survey Satellite (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 disk 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 modeling and that can be used to remove degeneracies in the modeling 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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Handler, Gerald
Pigulski, Andrzej
Daszyńska-Daszkiewicz, Jadwiga
Irrgang, Andreas
Kilkenny, David
Guo, Zhao
Przybilla, Norbert
Aliçavuş, Filiz Kahraman
Kallinger, Thomas
Pascual-Granado, Javier
Niemczura, Ewa
Różański, Tomasz
Chowdhury, Sowgata
Buzasi, Derek L.
Mirouh, Giovanni M.g.mirouh@surrey.ac.uk
Bowman, Dominic M.
Johnston, Cole
Pedersen, May G.
Simón-Díaz, Sergio
Moravveji, Ehsan
Gazeas, Kosmas
De Cat, Peter
Vanderspek, Roland K.
Ricker, George R.
Date : 28 February 2019
Funders : Science and Technology Facilities Council (STFC), European Union's Horizon 2020
DOI : 10.3847/2041-8213/ab095f
Copyright Disclaimer : From Sherpa Romeo: "Publisher's version/PDF may be used on any website or authors' institutional repository"
Uncontrolled Keywords : Stars: early-type. Stars: individual (HN Aqr). Stars: interiors. Stars: kinematics and dynamics. Stars: massive. Stars: oscillations (including pulsations).
Depositing User : Clive Harris
Date Deposited : 11 Mar 2019 15:01
Last Modified : 08 Oct 2019 09:29
URI: http://epubs.surrey.ac.uk/id/eprint/850711

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