Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-09-12
Astronomy and Astrophysics
Astrophysics
20 pages, 11 Postscript figures, uses aaspp4.sty and tighten.sty
Scientific paper
10.1086/303710
We investigate the modal stability of stellar models at masses and luminosity levels corresponding to post main sequence luminous delta scuti pulsators. The envelope models have been computed at fixed mass value, luminosity level and chemical composition (Y=0.28, Z=0.02). According to a nonlinear approach to radial oscillations the present investigation predicts the occurrence of stable second overtone pulsators for the first time. The shape of both light and velocity curves are presented and discussed, providing a useful tool for the identification of second overtone pulsators among the known groups of radially pulsating stars. The period ratios of mixed mode pulsators obtained by perturbing the first and the second overtone radial eigenfunctions are in agreement with observative values. Finally, the physical structure and the dynamical properties of second overtone pulsators are discussed in detail. The role played by the nodal lines in the destabilization of second overtone pulsators is also pointed out.
Bono Giuseppe
Caputo Filippina
Cassisi Santi
Castellani Vittorio
Marconi Marcella
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