Talk:Hertzsprung gap
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Shell hydrogen burning starts only when helium core ignites (see for ex. [[1]]) (core collapses and the outer layers expand) Orionus 19:38, 3 August 2006 (UTC)
On the other hand I am not sure, if it is "feature of the HR diagram for a star cluster". Hertzsprung plotted this diagramm for all stars. And I think he noticed the scarcity of stars in that region (now - the gap). But I should check original sources in order to state so. Orionus 19:47, 3 August 2006 (UTC)
