As a star's size increases, its luminosity generally increases. This is because larger stars have a greater surface area from which to emit light and heat, leading to higher overall energy output.
As a star's temperature increases, its luminosity also increases. This relationship is described by the Stefan-Boltzmann Law, which states that the luminosity of a star is proportional to the fourth power of its temperature (in Kelvin). Therefore, higher temperatures result in significantly higher luminosity.
In summary:
- As a star's size increases, its luminosity increases.
- As a star's temperature increases, its luminosity increases.