What information about a star can be inferred from its Doppler shift?

Answer 1

We can find out weather the star is going away from us or coming towards us. Also the speed at which it is going away from us or coming towards us.

Astronomers can benefit greatly from this information. Red shifts show that a star is moving away from us, while blue shifts show that it is moving toward us.

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Answer 2

John Alexander

The Doppler shift of a star provides information about its radial velocity, which indicates whether the star is moving towards or away from an observer. This can be used to determine the star's speed, direction of motion, and potential presence of companions in a binary system.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.