Abstract

Time-dependent numerical calculations, based on the conservation equations in difference equation form, are presented for a I M0 Pop II star evolving dynamically through its helium flash. With the heuristic method used to calculate time-dependent convection it is found that the convective core of the star explodes. The central temperature exceeds I0 0K and, at the time the calculations are halted, of the order of 5 x I0 erg have been deposited in the core. The evolution begins with an oscillation of the core of period 6o seconds imposed on the general expansion. The core cannot expand fast enough and slowly heats up. A composition gradient is formed in the convective core opposed to convection. Finally the core explodes. Throughout the calculation the total energy is conserved to I part in I