The Evolution of Massive Stars. I

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Abstract
The evolution of stars with mass 15.6 times the solar mass is considered in their early stage. Our model star consists of three regions; a convective core consuming hydrogen, a radiative envelope, and an intermediate zone of continuously varying composition. Radiation pressure is taken into account throughout the three regions. The hydrogen content in the core ranges from 90 per cent to 6.3 per cent by weight. It is found that the convective core retreats as its hydrogen content decreases, setting up the intermediate zone of continuously varying composition and a thin convective unstable region between the radiative envelope and the intermediate zone. The evolutionary track in the H−R diagram is compared with the stars of the h + χ Persei clusters.

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