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The HR diagram does not reference stars on their way to the main sequence, only during or after.
The temperature and luminosity of stars.
On the main sequence.
On the HR diagram the Sun's spectrum is of type G2 which makes it yellow.
The colors of the HR Diagram are:BlueBlue-WhiteYellowOrangeRed-OrangeRed
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.
The HR diagram contains only stars - so everywhere.
Of course they are on the HR diagram. They are simply not on the main sequence.
i don't know about the hr diagram but the brightest star known is r136a1
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.
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.
Our Sun is a G2V star and will thus appear in the centre of the HR diagram.
All stars.
Main sequence