3840039
doi
10.5281/zenodo.3840039
oai:zenodo.org:3840039
user-eu
user-mesa
S. Simón-Díaz
Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain.
D. M. Bowman
KU Leuven
G. Holgado
Centro de Astrobiología, CSIC-INTA, Campus ESAC, Camino bajo del Castillo s/n, E-28692 Madrid, Spain.
M. Michielsen
KU Leuven
A. de Burgos
Nordic Optical Telescope, E-38 711, Breña Baja, La Palma, Spain
N. Castro
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
R. H. Barbá
Departamento de Física y Astronom\'{i}a, Universidad de La Serena, Avenida Juan Cisternas 1200, La Serena, Chile
C. Aerts
KU Leuven
Variability of OB stars from TESS southern Sectors 1-13 and high-resolution IACOB and OWN spectroscopy
S. Burssens
KU Leuven
arxiv:arXiv:2005.09658
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
<p>Typical MESA and GYRE inlists associated with <a href="https://arxiv.org/abs/2005.09658">Burssens et al. 2020</a>. MESA v. 12155, GYRE version v. 5.2.</p>
<p><em>Context:</em> Lack of high-precision long-term continuous photometric data for large samples of stars has prevented the large-scale exploration of pulsational variability in the OB star regime. As a result, the candidates for in-depth asteroseismic modelling remained limited to a few tens of dwarfs. The TESS nominal space mission has surveyed the southern sky, including parts of the galactic plane, yielding continuous data of at least 27 d for hundreds of OB stars.<br>
<em>Aims:</em> We aim to couple TESS data in the southern sky with ground-based spectroscopy to study the variability in two dimensions, mass and evolution. We focus mainly on the presence of coherent pulsation modes that may or may not be present in the predicted theoretical instability domains and unravel all frequency behaviour in the amplitude spectra of the TESS data.<br>
<em>Methods: </em>We compose a sample of 98 OB-type stars observed by TESS in Sectors 1-13 and with available multi-epoch, high-resolution spectroscopy gathered by the IACOB and OWN surveys. We present the short-cadence 2-min light curves of dozens of OB-type stars, that have one or more spectra in the IACOB or OWN database. Based on these light curves and their Lomb-Scargle periodograms we perform variability classification and frequency analysis. We place the stars in the spectroscopic Hertzsprung-Russell diagram to interpret the variability in an evolutionary context.<br>
<em>Results:</em> We deduce diverse origins of the mmag-level variability found in all of the 98 OB stars in the TESS data. We find among the sample several new variable stars, including three hybrid pulsators, three eclipsing binaries, high frequency modes in a Be star, and potential heat-driven pulsations in two Oe stars. <br>
<em>Conclusions:</em> We identify stars for which future asteroseismic modelling is possible, provided mode identification is achieved. By comparing the position of the variables to theoretical instability strips we discuss the current shortcomings in non-adiabatic pulsation theory, and the distribution of pulsators in the upper Hertzsprung-Russell diagram.</p>
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Zenodo
2020-05-21
info:eu-repo/semantics/other
3840038
user-eu
user-mesa
award_title=Mixing and Angular Momentum tranSport of massIvE stars; award_number=670519; award_identifiers_scheme=url; award_identifiers_identifier=https://cordis.europa.eu/projects/670519; funder_id=00k4n6c32; funder_name=European Commission;
1590610832.664832
18182973
md5:1ee8a699d870af332d665c19e706e31d
https://zenodo.org/records/3840039/files/Burssens_et_al_2020_inlists.zip
public
arXiv:2005.09658
Is supplement to
arxiv
10.5281/zenodo.3840038
isVersionOf
doi