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

Journal article

Publication Details

Author(s): Handler G, Pigulski A, Daszynska-Daszkiewicz J, Irrgang A, Kilkenny D, Guo Z, Przybilla N, Alicavus FK, Kallinger T, Pascual-Granado J, Niemczura E, Rozanski T, Chowdhury S, Buzasi DL, Mirouh GM, Bowman DM, Johnston C, Pedersen MG, Simon-Diaz S, Moravveji E, Gazeas K, De Cat P, Vanderspek RK, Ricker GR
Journal: Astrophysical Journal Letters
Publication year: 2019
Volume: 873
Journal issue: 1
ISSN: 2041-8205
eISSN: 2041-8213


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
, 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.

FAU Authors / FAU Editors

Irrgang, Andreas Dr.
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut

External institutions with authors

Florida Gulf Coast University
Instituto de Astrofísica de Canarias (IAC)
Katholieke Universiteit Leuven (KUL) / Catholic University of Leuven
Leopold-Franzens-Universität Innsbruck / University of Innsbruck
Massachusetts Institute of Technology (MIT)
Medizinische Universität Wien
National and Kapodistrian University of Athens
Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences
Pennsylvania State University (Penn State)
Royal Observatory of Belgium / Koninklijke Sterrenwacht van België / Observatoire royal de Belgique
Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC)
University of Surrey
University of the Western Cape (UWC)
University of Wroclaw

How to cite

Handler, G., Pigulski, A., Daszynska-Daszkiewicz, J., Irrgang, A., Kilkenny, D., Guo, Z.,... Ricker, G.R. (2019). Asteroseismology of Massive Stars with the TESS Mission: The Runaway β Cep Pulsator PHL 346 = HN Aqr. Astrophysical Journal Letters, 873(1).

Handler, Gerald, et al. "Asteroseismology of Massive Stars with the TESS Mission: The Runaway β Cep Pulsator PHL 346 = HN Aqr." Astrophysical Journal Letters 873.1 (2019).


Last updated on 2019-23-08 at 08:34