How does the temperature in the core of a star affect the stars lifespan and luminosity?
Answer With a single star, ALL physical characteristics of the star, core temperature, surface temperature, lifespan, luminosity, diameter, color, spectral classification…are dependent and established, with the inital starting MASS. So MASS is the key number, not the core temperature, which is set by the initial starting mass. The higher the starting mass, the higher the core temperature and surface temperature, the shorter the lifespan (because the higher core temperatures use up the available fuel at a much more rapid and prodigious rate), and so the brigher the star (luminosity) and the larger the diameter. This is only true for isolated single stars, and widely separated multiple stars where there is no interaction with it’s partners. But it does not apply to close doubles where mass transfer between the partners can occur. This alters the initial mass state of the star in close, mass transfer, binaries. Very large massive stars (nature makes only one in a thousand) have such hig
