Answer
The hotter the temperature, the less of a difference it will make.
For an oven "at a temperature of 500", $500^{\circ}C = 773 K$ is very different from 500 K.
For an star "at a temperature of 50000", $50000^{\circ}C = 50000 + 273 = 50273 K$.
The absolute temperatures differ by only about a half-percent.