It is quite clear, for example, that stars of early spectral type are all young, whereas stars of late spectral type are a mixture of young and old.
Bluer main-sequence stars (spectral type O or B) are much brighter than main-sequence red stars (spectral type K or M).
Vega's spectral type is A (white) and its luminosity class V (main sequence).
Moreover, for stars of a given mass, a fair spread in radius, luminosity, surface temperature, and spectral type may exist.
The apex of the solar motion, the solar motion velocity, and its dispersion are all correlated with spectral type.
In stars of spectral type F, the lines of neutral atoms are weak relative to those of ionized atoms.
The brightest component star, Alpha Centauri A, resembles the Sun in spectral type, diameter, and absolute magnitude.
The results of his studies clearly demonstrated the relationship between the spectral type and colour of a star.
Stellar association, a very large, loose grouping of stars that are of similar spectral type and relatively recent origin.
Another important quantity that can be measured is a star's spectral type (see star: Classification of spectral types).
Take, for example, globular clusters, for which the solar motion is correlated with the spectral type of the clusters.
