Magnitude is the common term, the luminosity of a star is also used.
Brightness of stars (apparent and absolute magnitude) is measured by convention, taking an another star as a standard.
Age of the star, size, and temperature. The answer is in another post that I saw.
intrinsic magnitude
An apparent brightness is the brightness of a star as measured by an observer.
A star who's brightness changes is called a variable star.Examples are:AlgolPolarisBetelgeuse.See related link for more information.
Brightness of stars (apparent and absolute magnitude) is measured by convention, taking an another star as a standard.
Magnitude
the brightness of a star
The measure of a star's brightness is its magnitude. A star's brightness as it appears from Earth is called its Apparent Magnitude.Star's brightness is measured by there magnitude.
The brightness of a star is called its luminosity. This refers to the total amount of energy a star emits per second, taking into account its brightness across all wavelengths of light.
Age of the star, size, and temperature. The answer is in another post that I saw.
intrinsic magnitude
Scientists use the term magnitude to describe a star's brightness.
intrinsic magnitude
photographs use to measure the brightness of a star
Normally you would observe the star's brightness, not its apparent diameter.The star's apparent brightness ("apparent magnitude") depends on its real brightness ("absolute magnitude"), and on the distance. Similarly, the star's apparent angular diameter (which is VERY hard to measure) would depend on its actual diameter, and on the distance.
The brightness as seen from Earth is called the "apparent magnitude".The real brightness (defined as the apparent brightness, as seen from a standard distance) is called the "absolute magnitude".