The Temperature and Colour of Stars

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by Mikool
Last updated 6 years ago

Discipline:
Science
Subject:
Physics
Grade:
11

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The Temperature and Colour of Stars

The temperature of Stars are directly related to the temperature of its surface.

• A cooler star, with a surface temperature of perhaps 3000 K or 4000 K,produces most of its visible radiation at the longer wavelength, or red,end of the spectrum. It will therefore appear red.• As the temperature increases, the wavelengths peak in the yellow partof the spectrum, and a star will appear yellow.• At slightly higher temperatures, the distribution of the radiation ismore even and, as a result, a star will appear white.• A hotter star, with a surface temperature of 8000 K or more, producesmost of its visible radiation at the shorter wavelength, or blue, end ofthe spectrum. Therefore, it appears blue.

The temperature of stars are related to the temperature, as when stars emit higher temperature we get a higher amount of energy. With higher energy, results in a higher frequency and shorter wavelenghts. Colours on the visible spectrum towards the blue end contain these properties and this is the reason why stars towards the blue end of the visible spectrum are deemed to be hotter than those in the red end of the spectrum.

8.5.3 identify that the surface temperature of a star is related to its colour

The Colour of StarsAs many of you have seen in junior science or other classes, dealing with an open flame on a bunsen burner would help you understand why. A blue flame is a flame burning at very high temperatures. A yellow flame has temperatures that are cooler than blue flames and red flames are the coolest of all. The same thing happens with stars. Very hot stars tend to be blue stars. Stars with an average surface temperature become yellow stars like our sun. The coolest stars are Red Dwarfs.

As shown in the image to the right, temperature and colour are directly related.

As show from the graph to the right Black-body radiationcurves. As a black body becomes hotterthe peak of the curve shifts to shorter(bluer) wavelengths.

The Temperature and Colour of Stars


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