Ejnar Hertzsprung and Henry Russell H for Hertzsprung and R for Russell
main-sequence stars
It was invented in July 1880
Sankey diagram is named after Irish Captain Matthew Henry Phineas Riall Sankey. He first used this type of diagram in 1898.
The mathematical Carroll diagram was developed by Lewis Carroll. Carroll studied at the University of Oxford and later became a teacher of mathematics at Oxford.
I think it would be pretty safe to say he invented the Venn Diagram
The HR diagram contains only stars - so everywhere.
Of course they are on the HR diagram. They are simply not on the main sequence.
HR diagram
The red dwarves.
Up at the top right. If you look on the Australian Telescope National facility website, their HR diagram shows this clearly.
The main reason that the HR Diagram is so useful and important to scientists is, you can tell the size of the star by plotting it on the HR Diagram. The different sizes of stars form a pattern on the HR diagram.
All stars.
its located somewhere
Slightly to the right of centre on the main sequence. If you look on the Australian Telescope National facility website, their HR diagram shows the position of the sun.
The HR Diagram depicts the relationship between a star's luminosity (brightness) and temperature. Stars appear in different colors on the diagram, ranging from hot blue stars to cool red stars. The main sequence runs from hot, blue stars in the upper left to cool, red stars in the lower right.
The Bohr diagram was invented by Niels Bohr, a Danish physicist, in 1913. He used this diagram to depict the arrangement of electrons in an atom's energy levels.
Its called an HR diagram or a Hertzsprung-Russell diagram.