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Diverse Variability of O and B Stars Revealed from 2-minute Cadence Light Curves in Sectors 1 and 2 of the TESS Mission: Selection of an Asteroseismic Sample

Pedersen, May G., Chowdhury, Sowgata, Johnston, Cole, Bowman, Dominic M., Aerts, Conny, Handler, Gerald, Cat, Peter De, Neiner, Coralie, David-Uraz, Alexandre, Buzasi, Derek , Tkachenko, Andrew, Simón-Díaz, Sergio, Moravveji, Ehsan, Sikora, James, Mirouh, Giovanni, Lovekin, Catherine C., Cantiello, Matteo, Daszyńska-Daszkiewicz, Jadwiga, Pigulski, Andrzej, Vanderspek, Roland K. and Ricker, George R. (2019) Diverse Variability of O and B Stars Revealed from 2-minute Cadence Light Curves in Sectors 1 and 2 of the TESS Mission: Selection of an Asteroseismic Sample The Astrophysical Journal, 872 (1).

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Abstract

Uncertainties in stellar structure and evolution theory are largest for stars undergoing core convection on the main sequence. A powerful way to calibrate the free parameters used in the theory of stellar interiors is asteroseismology, which provides direct measurements of angular momentum and element transport. We report the detection and classification of new variable O and B stars using high-precision short-cadence (2 minutes) photometric observations assembled by the Transiting Exoplanet Survey Satellite (TESS). In our sample of 154 O and B stars, we detect a high percentage (90%) of variability. Among these we find 23 multiperiodic pulsators, 6 eclipsing binaries, 21 rotational variables, and 25 stars with stochastic low-frequency variability. Several additional variables overlap between these categories. Our study of O and B stars not only demonstrates the high data quality achieved by TESS for optimal studies of the variability of the most massive stars in the universe, but also represents the first step toward the selection and composition of a large sample of O and B pulsators with high potential for joint asteroseismic and spectroscopic modeling of their interior structure with unprecedented precision.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Pedersen, May G.
Chowdhury, Sowgata
Johnston, Cole
Bowman, Dominic M.
Aerts, Conny
Handler, Gerald
Cat, Peter De
Neiner, Coralie
David-Uraz, Alexandre
Buzasi, Derek
Tkachenko, Andrew
Simón-Díaz, Sergio
Moravveji, Ehsan
Sikora, James
Mirouh, Giovannig.mirouh@surrey.ac.uk
Lovekin, Catherine C.
Cantiello, Matteo
Daszyńska-Daszkiewicz, Jadwiga
Pigulski, Andrzej
Vanderspek, Roland K.
Ricker, George R.
Date : 8 January 2019
Funders : European Union's Horizon 2020, Science and Technology Facilities Council (STFC)
DOI : 10.3847/2041-8213/ab01e1
Grant Title : MAMSIE
Copyright Disclaimer : © 2019. The American Astronomical Society. All rights reserved
Depositing User : Clive Harris
Date Deposited : 11 Mar 2019 14:41
Last Modified : 08 Oct 2019 09:18
URI: http://epubs.surrey.ac.uk/id/eprint/850710

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