Delta Scuti Stars in Stellar Systems: the Case of HD 220392

P. Lampens¹, M. Van Camp¹ and D. Sinachopoulos^1,2
1 Royal Observatory of Belgium, Avenue Circulaire, 3, B-1180 Brussels, Belgium
² National Observatory of Athens, Lophos Nymphon, GR-11810, Greece
e-mail: Patricia.Lampens@oma.be

• Abstract
• Introduction
• Observations and reductions
• Period analyses
  • HD 220392
  • Geneva data
  • 
    ESO and Geneva data
  • 
    HIPPARCOS data
  • HD 220391
  • 
    ESO and Geneva data
  • 
    HIPPARCOS data
• Astrophysical considerations
  • The nature of the association
  • The nature of the variability
• Conclusion