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The Colour & Brightness of Stars

by Peter Eyland

This is a talk that Peter has given to different groups, such as Amateur Astronomy groups & High School groups.

Please note: Peter had many animations in his talk. Some are repeated below eg HR Diagram animation etc. Some appear as static images (i.e. not moving).

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Three animations explained how stars coalesce from their gases & ignite.

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★ Below is the address (URL) of that wonderful animation in Omega Centauri that was shown, with the stars being re-ordered into the Hertzsprung-Russell diagram.

Hertzsprung-Russell diagram animation

In this video, the stars in globular cluster Omega Centauri are rearranged according to their intrinsic brightness (vertical axis) and their temperature (horizontal axis). The temperature of a star dictates its apparent colour, with cooler stars being red and hotter ones being blue. The majority of stars at any given time fall into a wide band known as the main sequence, which passes from the top left (hot, bright stars) to the bottom right (cool, dim stars). However this is just a snapshot in time - as stars evolve they do not stay fixed to one point on the diagram for the whole of their lives.

Credit: NASA, ESA, J. Anderson and R. van der Marel (STScI)

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The following animation showed Pulsars.

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The following was an animation of stars behaviour around the black hole.

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The following was an animation of stars revolving around each other.

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The following shows an animation of variable stars.

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The following shows an animation of eclipsing binary with a planet.

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colourBrightnes of Stars

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