What does it mean the number after the stellar class? Magnitude?
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Jun 3, 2008 #2 Borek Mentor 29,304 4,037 Like in G2 for Sun? Subclass. The lower the digit, the colder the star.
Jun 3, 2008 #3 Janus Staff Emeritus Science Advisor Insights Author Gold Member 3,771 1,770 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
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