The Main Sequence
- When we look at different stars in the sky, we find that
about 90% of all stars fall on the Main Sequence.
- Most likely explanation is that Main Sequence stars
are constantly being born, and that they have very long
- Other stars, such as red giants are more rare than main
sequence stars, so their life spans should be shorter.
- Goal of the theory of the main sequence is to explain the
dependence of luminosity on temperature L(T) that is observed along
the main sequence. We have to explain, really L(M) and T(M)
A Hertzsprung-Russell Diagram showing the Main Sequence