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What do the letters at the bottom axis of the hr diagram represent?
The letters at the bottom axis of the Hertzsprung-Russell (HR) diagram represent the spectral classes of stars, ranging from hotter (O, B) to cooler (G, K, M). Each letter corresponds to a different temperature of the star.
Type of stars in the H-R diagram?
The HR diagram has the star's temperature along the horizontal axis and the absolute magnitude (brightness) along the vertical axis. Each star is represented by a single dot. Higher temperature is usually associated with more brightness so many stars lie on or near a line on the diagram called the Main Sequence. Red giant stars are found on the upper right hand quarter because they are relatively cool but still very bright.
Where is absolute magnitude indicated on the HR diagram?
its located somewhere
Where does a star spend most of its life on an hr diagram?
On the main sequence.
The hr diagram graphs what 2 things?
The temperature and luminosity of stars.
