Caption: A cartoon of stars illustrating the OBAFGKM spectral type sequence by a set of main-sequence stars that are accurately to-scale (one supposes) and in true-color (but probably only suggestively).
Note that post-main-sequence stars of the OBAFGKM spectral type sequence do NOT have unique sizes and are usually much larger: they are subgiants, giants, bright giants, supergiants, and hypergiants.
The OBAFGKM spectral types are mnemonicked by "O be a fine girl/guy kiss me."
Recall the Main-sequence rule:
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Stars are often contemplated in terms
of solar units which
are explicated in the insert file
solar_units.html
below
(local link /
general link: solar_units.html):
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Credit/Permission: ©
User:LucasVB,
2006 /
CC BY-SA 3.0.
Image link: Wikimedia Commons:
File:Morgan-Keenan spectral classification.png.
Local file: local link: star_natural_units_solar_units.html.
File: Star file:
star_natural_units_solar_units.html.