Main sequence – one o the main condensations in the Hertzsprung-Ressel diagram, which is the main sequence. It is dominated by the stars that are represented in the diagram. It has the appearance of a narrow strip that encompasses most of the stars represented on it.
The main order moves diagonally across the Hertzsprung-Ressel diagram from the upper left corner, where stars with large luminosities and early spectral classes – “O”, “B” – are displayed – to the lower right corner to stars with low luminosities or late spectral classes – “K”, “M”. The fundamental factor in determining the position of a star on the main sequence is its mass and, to a lesser extent, its age.
Main sequence
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