tähe näiv heledus, mida täht omaks, kui ta asuks 32,6 valgusaasta (10 parseki) kaugusel
measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale, corresponds to the apparent magnitude when the object would be at the distance of 32.6 light years (10 parsecs)
Hea teada
An object's absolute magnitude is defined to be equal to the apparent magnitude that the object would have if viewed from a distance of exactly 10 parsecs (32.6 light years), with no extinction (or dimming) of its light due to absorption by interstellar dust particles. Reference: 'Absolute magnitude'. Wikipedia, https://en.wikipedia.org/wiki/Absolute_magnitude [17.5.2017]
Narrow band systems can be used to estimate the strengths of absorption or emission lines or of other features in the spectrum. One, for example, measures the strength of the hydrogen H-beta line, a parameter related to temperature in some stars and to absolute magnitude in others.
