WHAT CAN THE COLOR OF A STAR TELL US?

COLOR OF STARS

• The color of light that we actually observe is related to the speed at which its moving with respect to us
• The color of light that a star emits is also somewhat related to its age
• According to Hubble the color of stars can tell us wether the stars are receding from us and the speed of their acceleration
• The temperature depends on some combination of the stars mass and evolutionary phase
• The color of a star tells us it's temperature

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• The color a star emits is different than the color that we observe
• The Doppler affect changes the frequency of light waves
• Frequency of light is directly related to its color
• Light emitted by a star moving away from us appears more red
• Light emitted by a star moving towards us appears more blue