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

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 (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Astrophysical Journal Letters American Astronomical Society

Book Volume: 873

Article Number: L4

Journal Issue: 1

DOI: 10.3847/2041-8213/ab095f

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.

Authors with CRIS profile

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

Involved external institutions

Nicolaus Copernicus Astronomical Centre of the Polish Academy of Sciences PL Poland (PL) University of Wroclaw / Uniwersytet Wrocławski PL Poland (PL) University of the Western Cape (UWC) ZA South Africa (ZA) Pennsylvania State University (Penn State) US United States (USA) (US) Leopold-Franzens-Universität Innsbruck / University of Innsbruck AT Austria (AT) Medizinische Universität Wien AT Austria (AT) Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC) ES Spain (ES) Florida Gulf Coast University US United States (USA) (US) University of Surrey GB United Kingdom (GB) Katholieke Universiteit Leuven (KUL) / Catholic University of Leuven BE Belgium (BE) Instituto de Astrofísica de Canarias (IAC) ES Spain (ES) National and Kapodistrian University of Athens GR Greece (GR) Royal Observatory of Belgium / Koninklijke Sterrenwacht van België / Observatoire royal de Belgique BE Belgium (BE) Massachusetts Institute of Technology (MIT) US United States (USA) (US)

How to cite

APA:

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). https://dx.doi.org/10.3847/2041-8213/ab095f

MLA:

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).

BibTeX: Download