What are “Red Shift” and “Blue Shift” with reference to a star’s spectrum?
A shift of pattern towards the red end of the spectrum indicates that the star is moving away from us. A “Blue Shift” indicates a movement towards us.
What is colour temperature?
As a star’s temperature rises, its predominant colour changes from infra red through ultraviolet.
How are spectral patterns of the stars classified to indicate the temperature of the stars?
spectral patterns of stars are classified in descending order of star temperature as O, B, A, F, G, K, M, R, N and S (O stars are blue and M stars are red).