What is the general lower limit for the surface temperatures of O-type stars in Kelvin?

Answer

30,000 Kelvin (K)

O-type stars generally possess surface temperatures that exceed 30,000 Kelvin, with the hottest examples approaching 50,000 K or higher.

What is the general lower limit for the surface temperatures of O-type stars in Kelvin?
physicsastronomytemperaturestarclass