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According to black-body radiation, violet stars are not possible. Even if there are 1 million Kelvin, they are blue, not violet. But are violet galaxies, nebulae, clusters etc. possible?

Google found a violet galaxy or nebula or black hole, but it looked like it was just painted at will. Can violet astronomical objects actually exist?

Some nebulae containing oxygen are green. I'm looking for non black-body violet.

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    $\begingroup$ Does this answer your question? Why are there no green stars? $\endgroup$
    – David Hammen
    Jun 29, 2021 at 11:11
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    $\begingroup$ No, I know about Black-body radiation. Green and violet star is impossible. But some of the other astronomical objects may not be black body. $\endgroup$
    – change
    Jun 29, 2021 at 11:15
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    $\begingroup$ Also related, Why don't we see purple stars? I did not choose that question as a duplicate because the selected answer s just wrong. $\endgroup$
    – David Hammen
    Jun 29, 2021 at 11:15
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    $\begingroup$ Some contain oxygen nebula are green. en.wikipedia.org/wiki/Green_star_%28astronomy%29 $\endgroup$
    – change
    Jun 29, 2021 at 11:26
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    $\begingroup$ The linked question says nothing but a green nebula. Do violet nebulae exist? $\endgroup$
    – change
    Jun 29, 2021 at 12:02

1 Answer 1

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Obviously, they can exist. There are blue stars:

enter image description here

There are red stars (red giants):

enter image description here

If these happen to circle one another you will perceive the entire system as violet (from Earth).

One of two stars can develop into a red giant while the other stays a hot blue one. It's the question if they can coexist in a double system but I can see no reason why not.

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    $\begingroup$ This sounds more like a guess based on how the human eye perceives the addition of primary colours. Can you be a bit more specific on the actual star types and wavelengths involved, and how narrow the light spectrum would be for each? Actual stellar examples, rather than unattributed and unlabelled photos, would be useful. $\endgroup$
    – Chappo Hasn't Forgotten
    Jul 1, 2021 at 0:51

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