The four categorys are main sequence, white dwarfs, red gaint, and super giants.
Of course they are on the HR diagram. They are simply not on the main sequence.
The red dwarves.
The colors of the HR Diagram are:BlueBlue-WhiteYellowOrangeRed-OrangeRed
Black holes dont appear on HR diagrams because HR diagrams are used to classify stars not find black holes Black holes emit no visible light (are not luminous enough) and therefore do not appear in the HR diagram.
The brightest stars on the Hertzsprung-Russell (HR) diagram are typically found in the top-left corner, known as the "upper main sequence." These stars are massive and luminous, such as blue supergiants or O-type stars. They have high temperatures and emit large amounts of energy.
The HR diagram contains only stars - so everywhere.
Of course they are on the HR diagram. They are simply not on the main sequence.
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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 colors of the HR Diagram are:BlueBlue-WhiteYellowOrangeRed-OrangeRed
Its called an HR diagram or a Hertzsprung-Russell diagram.