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Modeling of HD180642 = V1449 Aql ( THE only  Cephei star main target of CoRoT).

Anne Thoul + Maryline Briquet, Pieter Degroote, Andrea Miglio, Josefina Montalban, Conny Aerts, Thierry Morel, Ewa Niemczura, Kévin Belkacem, ... + the Corot B star Team. Modeling of HD180642 = V1449 Aql ( THE only  Cephei star main target of CoRoT). spectroscopy. photometry.

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Modeling of HD180642 = V1449 Aql ( THE only  Cephei star main target of CoRoT).

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  1. Corot 2009 - HD180642 - A.Thoul Anne Thoul + Maryline Briquet, Pieter Degroote, Andrea Miglio, Josefina Montalban, Conny Aerts, Thierry Morel, Ewa Niemczura, Kévin Belkacem, ... + the Corot B star Team Modeling of HD180642 = V1449 Aql(THE only  Cephei star main target of CoRoT).

  2. Corot 2009 - HD180642 - A.Thoul spectroscopy photometry Zobs=0.0099+-0.0016 HD180642 Data from T. Morel, E.Niemczura et al.

  3. Corot 2009 - HD180642 - A.Thoul ground photometry ground spectroscopy HD180642 dominant radial (l=0) mode 11 independent frequencies from Corot l=3 Courtesy Pieter Degroote P62

  4. Corot 2009 - HD180642 - A.Thoul df/dt=[7.6;14.4]10-11Hz/y df/dt ~10-10 Hz/y HD180642 0.7m Swiss telescope Degroote, Aerts et al Hipparcos 1.2m Mercator telescope COROT ASAS photometry

  5. Corot 2009 - HD180642 - A.Thoul HD180642 11 independent frequencies determined from Corot light curve Only one high frequency mode identified : the high amplitude radial mode One low frequency mode identified No clear multiplet Main radial mode shows a frequency decrease Photometric and spectroscopic error boxes do not overlap

  6. Corot 2009 - HD180642 - A.Thoul HD180642 Modelling: using CLES and OSC with AGS05 and OP opacities Fit the radial mode “Free parameters”: X, Z, ov, M

  7. Corot 2009 - HD180642 - A.Thoul HD180642 Range of parameters explored: X = 0.72 – 0.74 Z = 0.010 – 0.015 ov and M: all possible values which give solutions close to the error box in HR diagram

  8. Corot 2009 - HD180642 - A.Thoul n=3 n=2 n=1 X=0.72, Z=0.015, ov=0, M=12 HD180642 A. Fit the main frequency with the fundamental radial mode on the main sequence

  9. Corot 2009 - HD180642 - A.Thoul =0.4 =0.2 =0.0 M=12 M=10 HD180642 modelling radial mode with fundamental on MS effect of M and ov (X=0.72, Z=0.010)

  10. Corot 2009 - HD180642 - A.Thoul Z=0.010 Z=0.015 HD180642 modelling radial mode with fundamental on MS effect of Z (X=0.72, ov=0)

  11. Corot 2009 - HD180642 - A.Thoul X=0.72 X=0.74 M=10 M=12 HD180642 modelling radial mode with fundamental on MS effect of X(Z=0.010, ov=0)

  12. Corot 2009 - HD180642 - A.Thoul  log g fixed by radial mode M~9 M~13 HD180642 radial = fundamental on MS

  13. Corot 2009 - HD180642 - A.Thoul n=3 n=2 n=1 X=0.72, Z=0.015, ov=0, M=12 HD180642 B. Fit the main frequency with the first overtone of the radial mode on the main sequence

  14. Corot 2009 - HD180642 - A.Thoul HD180642 radial mode = first overtone M~10 M~13 radial mode = fundamental

  15. Corot 2009 - HD180642 - A.Thoul n=2 n=3 n=1 X=0.72, Z=0.015, ov=0.4, M=10 HD180642 C. Fit the main frequency with the second overtone of the radial mode on the main sequence

  16. Corot 2009 - HD180642 - A.Thoul HD180642 n=3 n=2 n=1

  17. Corot 2009 - HD180642 - A.Thoul n=3 n=2 n=1 n=2 n=1 n=3 n=3 n=2 X=0.72, Z=0.010, ov=0.2, M=10 log HD180642 D. Fit the main frequency with a radial mode after the TAMS

  18. Corot 2009 - HD180642 - A.Thoul n=3 n=2 n=1 HD180642 TAMS MS X=0.72,Z=0.010,ov=0.2,M=10

  19. Corot 2009 - HD180642 - A.Thoul HD180642 n=3 n=2 n=1

  20. Corot 2009 - HD180642 - A.Thoul HD180642 TAMS MS df/dt on MS much too small

  21. Corot 2009 - HD180642 - A.Thoul HD180642 TAMS MS

  22. Corot 2009 - HD180642 - A.Thoul HD180642 TAMS MS

  23. Corot 2009 - HD180642 - A.Thoul HD180642

  24. Corot 2009 - HD180642 - A.Thoul HD180642 spectroscopy photometry

  25. Corot 2009 - HD180642 - A.Thoul HD180642 X=0.72, Z=0.010, ov=0.5, M=10 X=0.72, Z=0.010, ov=0, M=10 X=0.72, Z=0.015, ov=0, M=10 X=0.72, Z=0.015, ov=0, M=12

  26. Corot 2009 - HD180642 - A.Thoul HD180642 X=0.72, Z=0.015, ov=0, M=9 radial mode is n=1, MS MAD radial mode is n=1, after TAMS radial mode is n=1, after TAMS radial mode is n=2, after TAMS radial mode is n=3, after TAMS

  27. Corot 2009 - HD180642 - A.Thoul HD180642 X=0.72, Z=0.015, ov=0.4, M=12 MAD radial mode is n=1, MS radial mode is n=2, MS radial mode is n=3, MS

  28. Corot 2009 - HD180642 - A.Thoul HD180642 CONCLUSIONS We’ve got a problem! Modelling of the star using main high amplitude radial mode: l=0, n=1  out of 2 error box in HR diagram (log g too high) range of excited frequencies more or less OK l=0, n=2  in 2 error box but range of excited frequencies too low l=0, n=3  in 1 error box but range of excited frequencies much too low df/dt cannot be explained by evolution

  29. Corot 2009 - HD180642 - A.Thoul HD180642 We’ve got a problem! Is log g correct? If yes, how can we have such high amplitude oscillations with high order radial modes? What about the excitation of the modes? What is the explanation for df/dt? Evolution? Resonant coupling? Is the star on MS or after TAMS? (1%)

  30. Corot 2009 - HD180642 - A.Thoul HD180642 A “CHIMERA” STAR Hybrid  Cephei / SPB star + solar-like oscillations (Kévin Belkacem et al.)  next step: try modelling the star using all stable and unstable modes NOTE: PROBLEM ==> We will learn something!

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