Reference : Effect of stellar rotation on oscillation frequencies
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Effect of stellar rotation on oscillation frequencies
Ouazzani, R. M. [LESIA, Observatoire de Paris; , Université Pierre et Marie Curie]
Goupil, M. J. [LESIA, Observatoire de Paris]
Dupret, Marc-Antoine [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Reese, D. [LESIA, Observatoire de Paris; Department of Applied Mathematics, University of Sheffield]
Astrophysics and Space Science
Yes (verified by ORBi)
[en] Stellar rotation ; Perturbative methods ; Splitting ; Differential rotation ; Stellar oscillation ; Beta Cephei
[en] We investigate whether the rotational splittings of β Cephei stars can give some clue about the existence of a differential rotation in latitude, and if they are contaminated by the cubic order effects of rotation on oscillation frequencies. We also study some properties of splitting asymmetries and axisymmetric mode frequencies which provide seismic constrains on the distortion of the star. We find that only non-perturbative methods are able to reproduce those two seismic characteristics within 0.01% error bars for stars when they rotate faster than 3.3% Ω [SUB] k [/SUB]. If error bars of 1% are acceptable, the threshold of validity of perturbative methods is extended to 10% Ω [SUB] k [/SUB].

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