Subject |
has specie |
has width |
has wavelength |
occurs in |
has definition |
color | | | | | |
luminosity | | | | | Total radiant energy output per second (absolute brightness, usually expressed in ergs s-1 or in magnitudes). L = 4πR2σT4 (see Stefan's law). |
magnitude | | | | | A measure. on a logarithmic scale, used to indicate the brightness of a celestial object. A 1-magnitude difference in brightness between two stars corresponds to a difference in luminosity by 100.4 or 2.51; 5 magnitudes corresponds to factor of 100 in luminosity. |
spectral feature | | | | | A feature in the spectra of a celestial object which occurs at a specific wavelength or range of wavelengths |