Rainbows on Tatooine

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stefan r
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I know it did not rain on Tatooine and the planet does not exist.

My question is would a rainbow look like on a planet in a binary star system?

Assume that it does rain, the raindrops come in a broad range of sizes including some showers with fairly uniform drop size, and that there is an atmosphere with similar density and light scattering as earth.

I expect that blue stars will have more intense blue bands and red stars create more intense red. Is that always correct?

I believe the rainbow would be identical to a rainbow on earth at the point where the bow's tangent line is parallel to the line connecting the stars. I am not sure what happens on the rest of the arc. Would it look like a reflection rainbow. Except that the arcs would not converge at the horizon.
triple-rainbow-450x450.jpg



It is also not clear to me what supernumary rainbows would look like. They are created by an interference pattern but does that mean a binary star system has more of them, less, or relatively the same?

w-033-03.jpg



Feel free to add any ideas on what effect a different atmosphere would have.
 

Answers and Replies

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I expect that blue stars will have more intense blue bands and red stars create more intense red. Is that always correct?
It also depends on the atmosphere, but in general: sure.

Multiple stars in the sky simply lead to multiple independent rainbows. If their brightness ratio is large, it will be hard to see rainbows from the dimmer star.
 

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