Theoretical aspects of g-mode pulsations in γ Doradus stars

Details Theoretical aspects of g-mode pulsations in γ Doradus stars Theoretical aspects of g-mode pulsations in γ Doradus stars

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007coast.150...98d&link_type=abstract

Communications in Astroseismology, Vol. 150, p.98

Physics

2

Scientific paper

γ Dor stars are main sequence variable A-F stars whose long periods (between 0.35 and 3 days) correspond to high-order gravity mode pulsation. First, we present some aspects of their internal physics and evolutionary status. Second, we consider the potential of the g modes as a probe of these internal physics. In particular, we consider the effect of sharp features present near the convective core top on the g-mode period pattern. Third, we analyse the driving mechanism of the γ Dor g modes, we stress the role of Time-Dependent Convection (TDC) and for the first time we study the role played by turbulent viscosity variations in this frame. Finally, we consider the important problem of mode identification. We show that the theoretical multi-colour photometric amplitude ratios and the phase differences between the light and velocity curves predicted by TDC models much better agree with observations than Frozen Convection (FC) models. Hence, a more secure photometric mode identification is possible with TDC models.

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