What are the hottest dimmest stars?

The hottest dimmest stars are known as white dwarfs, which are the remnants of stars that have exhausted their nuclear fuel. These stars can reach surface temperatures exceeding 100,000 Kelvin, making them extremely hot, but their small size results in relatively low luminosity. Their dimness is due to their limited energy output, as they no longer undergo fusion. Over time, white dwarfs cool down and fade, becoming even dimmer.