2005A&A...443..271S -
Astronomy and Astrophysics, volume 443271-282 (2005/11-3)
Frequency ratio method for seismic modelling of γ Doradus stars. II. The role of rotation.
SUAREZ J.C., MOYA A., MARTIN-RUIZ S., AMADO P.J., GRIGAHCENE A. and GARRIDO R.
Abstract (from CDS):
The effect of rotation on the Frequency Ratio Method (Moya et al.,
2005A&A...432..189M) is examined. Its applicability to observed frequencies of rotating γ Doradus stars is discussed taking into account the following aspects: the use of a perturbative approach to compute adiabatic oscillation frequencies; the effect of rotation on the observational Brunt-Vaeisaelae integral determination and finally, the problem of disentangling multiplet-like structures from frequency patterns due to the period spacing expected for high-order gravity modes in asymptotic regime. This analysis reveals that the FRM produces reliable results for objects with rotational velocities up to 70km/s, for which the FRM intrinsic error increases one order of magnitude with respect to the typical FRM errors given in Moya et al. (
2005A&A...432..189M). Our computations suggest that, given the spherical degree l identification, the FRM may be discriminating for m=0 modes, in the sense that the method avoids any misinterpretation induced by the presence of rotationally split multiplet-like structures, which reinforces the robustness of the method. However, if l is unknown, such discrimination is not ensured. In order to check the FRM in presence of slow-moderate rotation, we have applied it to the three observed frequencies of the slowly rotating (vsin i=29km/s) γ Doradus star
HD48501.
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Journal keyword(s):
stars: rotation - stars: oscillations - stars: fundamental parameters - stars: evolution - stars: individual: HD48501 - stars: general
Simbad objects:
2
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