The star is hotter because the fusion process is more energetic, and photons are emitted as a result of fusion. So more energetic fusion...more energetic photons. On the electromagnetic spectrum, higher energy is to the right, which is the "brighter" end of the spectrum.
Any hot object will glow brighter when it is hotter.
One reason could be that the brighter star is larger and hotter, emitting more light. Another reason could be that the brighter star is located closer to Earth, making it appear brighter in the sky.
Three physical factors that determine a star's brightness are its temperature (hotter stars are brighter), size (larger stars are generally brighter), and distance from Earth (the closer a star is, the brighter it appears).
It all depends on the luminousity of the star and the relative distance of the observer.
The hotter the star, the brighter. Ex: A stove
The size of the star, because the smaller the star the hotter it is because of nuclear fusion. So the hotter the brighter.
Any hot object will glow brighter when it is hotter.
You know, VV cephie is orange, sun is yellow and yellow is brighter than orange and the brighter the star is, the hotter it gets. So sun is hotter than VV cephie.
The bigger and hotter a star is, the shorter its lifespan will be. This is because higher temperatures cause stars to burn through their fuel more quickly, leading to a faster depletion of their energy source and a shorter overall existence.
One reason could be that the brighter star is larger and hotter, emitting more light. Another reason could be that the brighter star is located closer to Earth, making it appear brighter in the sky.
Oxygen is what makes things burn at all. The more oxygen there is, the brighter it can burn.
In terms of absolute magnitude, a larger hotter star will necessarily be more luminous than a smaller cooler star. However, if a smaller cooler star is much closer to us than a larger hotter star, it may appear to be brighter. None of this has anything to do with the HR diagram.
Three physical factors that determine a star's brightness are its temperature (hotter stars are brighter), size (larger stars are generally brighter), and distance from Earth (the closer a star is, the brighter it appears).
Stars with larger masses have stronger gravity; this results in more pressure; which in turn makes the star hotter. As a result of the higher temperature, they will shine brighter, and burn their fuel much faster.
It all depends on the luminousity of the star and the relative distance of the observer.
The hotter the star, the brighter. Ex: A stove
A supergiant is brighter than a red giant. That means it spends its energy faster, and lives less. To burn its energy faster, it must be hotter in its nucleus. That doesn't necessarily mean that its surface temperature is faster (rather, it will usually be bigger, and have a larger surface to irradiate).