PHysics of Oscillating STars
Published November 30, 2018 | Version v1
Conference paper Open

Photometric detection of internal gravity waves in early-type stars observed by CoRoT

Creators

  • 1. Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
  • 2. School of Mathematics, Statistics and Physics, Newcastle University, Newcastle-upon-Tyne NE1 7RU, UK
  • 3. Instituto de Astrofísicade Canarias, E-38200 La Laguna, Tenerife, Spain
  • 4. Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia
  • 5. Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium

Description

Early-type stars are predicted to excite an entire spectrum of internal gravity waves (IGWs) at the interface of their convective cores and radiative envelopes. Numerical simulations of IGWs predict stochastic low-frequency variability in photometric observations, yet the detection of IGWs in early-type stars has been limited by a dearth of high-quality photometric time series. We present observational evidence of stochastic low-frequency variability in the CoRoT photometry of a sample of O, B, A and F stars. The presence of this stochastic low-frequency variability in stars across the upper main-sequence cannot be universally explained as granulation or stellar winds, but its morphology is found to be consistent with predictions from IGW simulations.

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Additional details

Funding

MAMSIE – Mixing and Angular Momentum tranSport of massIvE stars 670519
European Commission

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