What does it mean the number after the stellar class? Magnitude?

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What does it mean the number after the stellar class? Magnitude?
 

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  • #2
Borek
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Like in G2 for Sun? Subclass. The lower the digit, the colder the star.
 
  • #3
Janus
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If instead, you mean the roman numeral sometimes placed after the spectral class, this is the luminosity class as follows:

0 Hyper giant
I Super giant
II Bright giant
III Normal giant
IV Sub giant
V Main sequence (dwarf)
VI Sub dwarf
VII White dwarf

Thus the Sun is a G2 V star.

Sub classes of the luminosity class are labled a,ab & b
 
  • #4
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Great.
 

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