The single most important determinant of the temperature, density, radius, luminosity, andpace of evolution of a protostar is its:

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The mass of a protostar is the single most important determinant of its temperature, density, radius, luminosity, and pace of evolution. A protostar's mass determines the amount of gravitational potential energy available to power its nuclear fusion reactions, and therefore determines its luminosity, temperature, and ultimate fate as a star. The mass of a protostar determines its temperature, density, radius, luminosity, and pace of evolution. The higher the mass, the hotter and brighter the star, and the faster it evolves. The chemical and molecular composition can affect specific properties, such as the opacity of the interior, but they are not as important as mass in determining the overall behavior of the protostar. Magnetic fields and spins can also play a role, but they are secondary to mass.

The Single Most Important Determinant of the Temperature, Density, Radius