It is brighter because it is emitting more gasses at a faster rate than other sized main sequence stars.
Cursa is a binary star system consisting of a B-type star and a fainter star. The B-type star is a hot, blue-white star that is more massive and luminous than the Sun.
Any hot object will glow brighter when it is hotter.
Sirius appears brighter than Pollux because it is closer to Earth and is a more luminous star. Sirius is also a hot, blue star compared to Pollux, which is a cooler, orange giant star, further contributing to the difference in brightness.
The blue star is the hottest star.
Alkaid is the brightest star in the constellation Ursa Major, while Mizar is a fainter star in the same constellation. Alkaid is a hot, blue star that is much more luminous than Mizar, which is actually a double star system.
A red star is cool whereas a blue star is hot.
All stars are hot. Blue stars are the hottest.
Sirius is a binary star system with two main stars, Sirius A and Sirius B. Sirius A, the brighter and more massive star, has a surface temperature of around 9,940°C (17,964°F). Sirius B, the smaller and fainter star, has a surface temperature of about 25,200°C (45,332°F).
when the star gets really hot
All stars are hot. Blue stars are the hottest. The hotter a star is, the shorter the wavelength of light it emits. Blue light has a shorter wavelengths than most other colors.
If a blue star wasn't so hot - it wouldn't be a blue star - it would be a white star.See related question for more details.
It relates to how hot it is because if it was blue it would be a hotstar and it it was red it would be a cool star!