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Suppose that the physical properties of two stars are identical in every way --- for example, same distance, same mass, same temperature, same chemical composition, and same speed relative to Earth --- except that one star rotates faster than the other. Spectroscopically, how could you tell the stars apart?

User Steveire
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Answer:

By measuring it's Radical velocity using Doppler Phenomenon...

Step-by-step explanation:

It is done by measuring the absorption spectrum produces by a star as a result of measuring Doppler's relative wavelength. The star with the lower speed must have lower absorption spectrum extent as compared to the faster one.

User Saad Mirza
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