How to use this guide
Each entry gives the kind of star, the trait a deficit label fixes on, what that trait actually is, key data, and full field notes. Click any entry to open its notes.
On the main sequence
Most stars spend their fusing lives on a diagonal band astronomers call the main sequence. It's a phase, not a ranking — and plenty of real stars live on it, above it, below it, or entirely off it. There is no standard star.
On the diagrams
Each diagram is the same star-map — the Hertzsprung–Russell diagram, hot-to-cool across and dim-to-bright up — with this star's way of being lit on it. Same map every time; a different place to stand.