IZ Tel and UW Vir are oEA binaries with δ Sct primaries showing mass transfer, derived masses of 1.48/0.33 and 2.39/0.67 solar masses, and multi-frequency pulsations including combination modes.
The role of turbulent pressure as a coherent pulsational driving mechanism: the case of the delta Scuti star HD 187547
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abstract
HD 187547 was the first candidate that led to the suggestion that solar-like oscillations are present in delta Scuti stars. Longer observations, however, show that the modes interpreted as solar-like oscillations have either very long mode lifetimes, longer than 960 days, or are coherent. These results are incompatible with the nature of `pure' stochastic excitation as observed in solar-like stars. Nonetheless, one point is certain: the opacity mechanism alone cannot explain the oscillation spectrum of HD 187547. Here we present new theoretical investigations showing that convection dynamics can intrinsically excite coherent pulsations in the chemically peculiar delta Scuti star HD 187547. More precisely, it is the perturbations of the mean Reynold stresses (turbulent pressure) that drives the pulsations and the excitation takes place predominantly in the hydrogen ionization zone.
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UNVERDICTED 2representative citing papers
Observational analysis of HD210684 yields rotational period 5.02188 d, magnetic obliquity 77°, and main-sequence age ~1.45 Gyr from photometry, LSD magnetic measurements, and MESA/GYRE modeling.
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IZ Tel and UW Vir: Southern oscillating eclipsing Algol systems with active mass transfer
IZ Tel and UW Vir are oEA binaries with δ Sct primaries showing mass transfer, derived masses of 1.48/0.33 and 2.39/0.67 solar masses, and multi-frequency pulsations including combination modes.
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Study of photometric and spectral variability of the roAp star HD~210684
Observational analysis of HD210684 yields rotational period 5.02188 d, magnetic obliquity 77°, and main-sequence age ~1.45 Gyr from photometry, LSD magnetic measurements, and MESA/GYRE modeling.