OBSERVATIONAL SIGNATURES OF CONVECTIVELY DRIVEN WAVES IN MASSIVE STARS

C. Aerts, Tamara Rogers

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We demonstrate observational evidence for the occurrence of convectively driven internal gravity waves (IGWs) in young massive O-type stars observed with high-precision CoRoT space photometry. This evidence results from a comparison between velocity spectra based on two-dimensional hydrodynamical simulations of IGWs in a differentially rotating massive star and the observed spectra. We also show that the velocity spectra caused by IGWs may lead to detectable line-profile variability and explain the occurrence of macroturbulence in the observed line profiles of OB stars. Our findings provide predictions that can readily be tested by including a sample of bright, slowly and rapidly rotating OB-type stars in the scientific program of the K2 mission accompanied by high-precision spectroscopy and their confrontation with multi-dimensional hydrodynamic simulations of IGWs for various masses and ages.

Original languageEnglish (US)
Article numberL33
JournalAstrophysical Journal Letters
Volume806
Issue number2
DOIs
StatePublished - Jun 20 2015

    Fingerprint

Keywords

  • Asteroseismology
  • Line: profiles
  • Stars: massive
  • Stars: oscillations
  • Techniques: photometric
  • Waves

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this