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The spectral class is A0Va.
Our Sun has a spectral class of G2V.
Antares has a spectral class of M1LB.
Spectral class Y, which is typical of "brown dwarf" stars.
Spectral class is classification of stars by their external features..Like light,temperature etc..
Sirius is a double star. The brighter component ... the one you actually notice in the night sky ... is spectral class A1V. The faint 'secondary' component is spectral class DA2.
M2 variable.
Astronomy.
Class O
K (orange )
Spectral class is the categorization of stars by temperature and size, mostly the former. Spectral class B is very hot. In descending order (hottest to coolest) the spectral classes are O,B,A,F,G,K,M. You can see that B is very near the top.
Alpha Centauri A - It is 4.365 light years away and has a spectral class of G2V the same as our Sun