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Using the von Sengbusch-Stellingwerf relaxation method, hydrodynamic calculations have been made to find strictly periodic solutions for the fundamental mode pulsations of 7 M⊙ models. These models have a helium enrichment in the surface convection zones up to Y = 0.78. From the linear theory period ratio π2/π0 and the Simon and Schmidt resonance hypothesis, the observed Hertzsprung progression of...
A discussion of the long period R Coronae Borealis stars is presented. The constraints on theoretical models imposed by their age, kinematics and distribution led to difficulties in formulating an evolutionary sequence to the formation of this type of star. Several types of models are investigated and the results given.
White dwarf pulsators (ZZ Ceti variables) occur in the extension of the radial pulsation envelope ionization instability strip to the observed luminosities of 3 × 10−3 L⊙ according to van Horn (1979). Investigations have been underway to see if the driving mechanisms of hydrogen and helium ionization can cause radial pulsations as they do for the Cepheids, the RR Lyrae variables, and the δ Scuti variables...
Using results from earlier studies of double-mode dwarf Cepheids by Cox, King and Hodson (1979), hydrodynamic calculations have been undertaken for AI Vel. The evolution theory mass of 1.8 M⊙ previously derived, together with a luminosity of 23 L⊙ and a Te of 7500 K, give the observed period of 0.11 day and the observed period ratio π1/π0 = 0.773. Although the observed Te was 7620 K, a cooler Te is...
Variability in the performance of shared system components is a major obstacle in analyzing the effective throughput of leadership class computers. Shared file systems and networks are serious impediments to achieving repeatable application performance on HPC systems. In particular, performance analysts are likely to be interested in quantifying differences between average-case behavior, worst-case...
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