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P-type pulsators on the main sequence of HR Diagram

P-type pulsators on the main sequence of HR Diagram. Gyöngyi Kerekes COROT-day Budapest March, 2007. HRD. SPB. γ Doradus. β Cephei. δ Scuti. Comparison. δ Scuti HD 170782. V mag = 7.81 Spectral type: A2 Outside of the instability strip, blue edge

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P-type pulsators on the main sequence of HR Diagram

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  1. P-type pulsators on the main sequence of HR Diagram Gyöngyi Kerekes COROT-day Budapest March, 2007

  2. HRD SPB γ Doradus β Cephei δ Scuti

  3. Comparison

  4. δ ScutiHD 170782 • Vmag = 7.81 • Spectral type: A2 • Outside of the instability strip, blue edge • Reopens the problem of variability

  5. 6 1 4 2 5 3 Whitening 1 2 3 4 5 6

  6. Fitting

  7. Frequencies of HD 170782

  8. βCephei stars • Known since 1902 • 10-20 solar masses • Main pulsation modes  radial • But non-radial pulsations also detected • Large fraction is multiperiodic • Frequency spectrum is not too dense  modelling becomes possible • Very interesting from astroseismologic point of view

  9. β Cephei HD 180642 • Main target of the first COROT long run • Vmag = 8.3 • Spectral type: B 1.5

  10. 2 1 3 4 5 6 7 Whitening 1 2 3 4 5 6 7

  11. Fitting

  12. Frequencies

  13. Conclusions • Main obtained frequencies: • Trends in light curves↓Further cleanings are required • HD 170782belongs to small amplitudeδ Scutis →maybe more modes are excited →COROT’s task to investigate if there are more modes

  14. Thank you for your attention!

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