The pulsations of ZZ Ceti stars. IV - The instability strip

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Stellar Models, Stellar Oscillations, Variable Stars, White Dwarf Stars, Astrophysics, Blue Stars, Hydrogen Ions

Scientific paper

The decrease in the amplitude of the theoretical brightness changes in ZZ Ceti stars are used as the depth of the convective zone increases in order to fix the position of the red edge and to explain the period-temperature correlation in these stars. The width of the ZZ Ceti instability strip in the T(e)-log g plan is determined at less than 1000 K. It is argued that this value is consistent with the statistics of these stars and that the much wider spread in temperature which has been found in several investigations may be due to observational errors. Calibration for the mixing length theory of convection on the basis of the mean temperature of the ZZ Ceti stars is in broad agreement with the solar calibration.

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