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coloured stars?
I would like to be able to show some (telescopic) coloured stars at an upcoming public event.
On the red end of the spectrum, the carbon star EsB 365 near beta crux is by far the reddest in my experience, but since it is not visible in the mid evening at the moment, I thought I would go for r leporis.
On the blue end, I have struggled to find a list of 'bluest stars', or a list of stars with the most negative BV indices to check out. zeta puppis at BV -0.27 is as low as I have found, but it needs a lot of imagination to truly call it blue.
Maybe a bright blue nebula (which one?) would be a better way to go.
Any other ideas?
Andrew
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