There could be many answers as dim and hot are mutually exclusive
Brightness (or dimness for that matter) is defined as a stars luminosity and it's distance from the observer.
So a hot star could be very far away and appear dim, whereas if it was relatively close, it would appear bright.
A hot but small star, would appear dim at a close distance.
However, in all likelihood the answer you might be looking for is either:
hot,dim stars.
Red-hot and blue-hot stars emit light across a wide range of wavelengths, which blend together to create a white appearance to our eyes. The combination of the different colors of light emitted by the stars results in an overall white color when we see them.
Stars may appear dim due to their distance from Earth, dust and gas in space that can absorb or scatter their light, or because they are inherently less luminous than other stars. The dimness of a star can also depend on its age, size, and temperature.
Blue stars are typically hotter than other colored stars. They have surface temperatures ranging from 10,000 to 40,000 Kelvin, which is significantly higher than many other types of stars.
Stars that are cool and dim would be found in the lower right corner of the Hertzsprung-Russell diagram, in the region known as the "lower right" or "lower main sequence." These stars have low luminosity and temperature compared to other stars on the diagram.
I assume you mean a DWARF STAR. There are different types of dwarf stars; the white dwarfs are fairly hot - but the reason they are dim is that they have a very small surface area.
hot,dim stars.
hot, bright stars
White dwarves.
stars that are dim probably have both a small mass and a larger radius.
White Dwarf Stars are very hot, like a ball of fire. They are dim because they are small and very far away.
Stars Go Dim was created in 2007.
Stars can be seen (in perfect conditions with perfect eyesight) as dim as 6th magnitude. This includes all types of star. Stars which are either too far away or too intrinsically dim cannot be seen.
Dwarf stars are dim because they are smaller and cooler than other types of stars. Their lower temperature and smaller surface area result in less light being emitted compared to larger, hotter stars. This makes them appear dimmer when observed from a distance.
Red-hot and blue-hot stars emit light across a wide range of wavelengths, which blend together to create a white appearance to our eyes. The combination of the different colors of light emitted by the stars results in an overall white color when we see them.
some stars are hotter than others because they have more hydrogen to use and create heat with. BTW- answered by a 6th grader.
None of them are cool and dim; the one in the white/black dwarfs are cool and dim.