 The luminosity of a star is the amount of light and other forms of radiant energy it radiates per unit of time . It has units of power . The luminosity of a star is determined by its radius and surface temperature . Many stars do not radiate uniformly across their entire surface . The rapidly rotating star Vega , for example , has a higher energy flux ( power per unit area ) at its poles than along its equator . 
 The luminosity of a star <a href='drop_aux' title='1'><mark>is</mark></a>the amount of light and other forms of radiant energy it <a href='uninflect' title='2'><mark>radiates</mark></a> per unit of time . It <a href='got' title='3'><mark>has</mark></a> units of power . The luminosity of a star is determined by its radius and surface temperature . Many stars do not radiate uniformly across their entire surface . The rapidly rotating star Vega , for example , <a href='got' title='4'><mark>has</mark></a> a higher energy flux ( power per unit area ) at its poles than along its equator . 
The luminosity of a star the amount of light and other forms of radiant energy it radiate per unit of time . It got units of power . The luminosity of a star is determined by its radius and surface temperature . Many stars do not radiate uniformly across their entire surface . The rapidly rotating star Vega , for example , got a higher energy flux ( power per unit area ) at its poles den along its equator .