Asteroseismology of massive stars with the TESS mission: the runaway β Cep pulsator PHL 346 = HN Aqr
| Autor: | Zhao Guo, Sergio Simón-Díaz, J. Pascual-Granado, Dominic M. Bowman, George R. Ricker, Filiz Kahraman Alicavus, Cole Johnston, M. G. Pedersen, Derek Buzasi, David Kilkenny, Thomas Kallinger, Peter De Cat, G. M. Mirouh, Tomasz Różański, Kosmas Gazeas, Ehsan Moravveji, S. Chowdhury, Jadwiga Daszyńska-Daszkiewicz, Gerald Handler, Norbert Przybilla, Ewa Niemczura, Andreas Irrgang, Roland Vanderspek, Andrzej Pigulski |
|---|---|
| Přispěvatelé: | Gobierno de Canarias, Polish Academy of Sciences, Science and Technology Facilities Council (UK), European Space Agency, Danish National Research Foundation, Ministerio de Economía, Industria y Competitividad (España), European Research Council, Aarhus University Research Foundation, National Aeronautics and Space Administration (US) |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
FOS: Physical sciences Binary number oscillations (including pulsations) [Stars] Astrophysics Astronomy & Astrophysics Star (graph theory) individual (HN Aqr) [Stars] 01 natural sciences Asteroseismology Stars: kinematics and dynamics Stars: early-type Stars: oscillations (including pulsations) early-type [Stars] SEARCH 0103 physical sciences massive [Stars] PHOTOMETRY kinematics and dynamics [Stars] Astrophysics::Solar and Stellar Astrophysics Stars: massive 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Physics Science & Technology Oscillation interiors [Stars] Astronomy and Astrophysics Radial velocity VARIABILITY Stars Amplitude Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Beta (plasma physics) Physical Sciences Stars: interiors Stars: individual (HN Aqr) Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | The Astrophysical Journal Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 0067-0049 0004-637X 0004-6361 1538-3873 1286-4846 0035-8711 1538-3881 |
| Popis: | 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. © 2019. The American Astronomical Society. All rights reserved.. This Letter includes data collected by the TESS mission. Funding for the TESS mission is provided by the NASA Explorer Program. Funding for the TESS Asteroseismic Science Operations Centre is provided by the Danish National Research Foundation (grant agreement No.: DNRF106), ESA PRODEX (PEA 4000119301) and Stellar Astrophysics Centre (SAC) at Aarhus University. We thank the TESS team and staff and TASC/TASOC for their support of the present work. This work is also based on observations collected at the European Southern Observatory under ESO programme 383.D-0909(A). Funding through the Polish NCN grants 2015/18/A/ST9/00578, 2016/21/B/ST9/01126, 2015/17/B/ST9/02082 and 2014/13/B/ST9/00902 is gratefully acknowledged. G.M.M. acknowledges funding by the STFC consolidated grant ST/R000603/1. The research leading to these results has received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No. 670519: MAMSIE). S.S.-D. acknowledges funding by the Spanish MCIU (projects AYA2015-68012-C2-1-P and SEV2015-0548) and the Gobierno de Canarias (project ProID2017010115). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|