The exercise is divided in the four following steps:
This was proposed to the members of the COROT sismogroup, asking for who wanted to participate and to what step of the exercise. We had many responses of volonteers from different laboratories and we tried to regroup them in teams listed here. The belgian asteroseismology group joined the exercise very recently and constitutes the fourth team.
1) Produce a set of theoretical oscillation frequencies (with degrees = 0,1,2,3) and their rotational splittings for a stellar model satisfying given constraints on luminosity L, effective temperature Teff and chemical composition Z/X. We have chosen the following constraints which correspond to a solar like star. These domains of mass and evolutionary stage are interesting because they correspond to models with a convective core large enough for significant effects of overshoot beeing expected: 0.83 < log(L) < 0.8, 3.8062 < log(Teff) < 3.8195, 0.019 < Z/X < 0.03. Other sets of constraints corresponding to the COROT targets could be chosen.
2) Construct a COROT simulated time series} including that set of theoretical frequencies, COROT noise, stellar noise, inclination angle of the rotation axis, amplitude and life time of the modes.....
3) Extract from the synthetic spectra the frequencies and splittings with their formal errors leading to an 'observed' set of frequencies.
4) Derive the structure and rotation of the stellar model from the set of frequencies
The data for this HH and the frequencies obtained from step 3) can be found here.
Last updated by Thierry Appourchaux on April 8, 2002