Emarion Star System(s)

[EDG]

Correction: We have yet to observe any stars that are green. That doesn't mean that a particular star couldn't be the subject of a particular phenomenon that makes it so. We've got a good grasp of stellar physics, but it's hubris to think we have everything figured out.

(sorry, bit of a bump here, but I didn't want to let this slide).

As an aside to the thread (the OP has said that what he's describing is not our universe and therefore stars can be green in it, which is fair enough) - but you're incorrect: in our universe, we do actually know that stars can't naturally appear green. Stars emit a range of wavelengths, depending on their temperatures. Very hot stars look blue because their wavelength distribution is shifted towards the blue end of the spectrum (they actually emit a lot of UV as well). The wavelengths emitted by cool stars are towards the other end of the spectrum - they have hardly any blue wavelengths in their light and so they look mostly red (and emit more IR radiation). Stars that are between the two would appear orange, yellow, white, or blue-white depending on how hot they were. You would expect the "white" (type F) stars to actually appear green, since their wavelength peak would be in the middle of the visible light spectrum - but since they're emitting bluer and redder wavelengths as well the combination always appears white.

So you can't get stars emitting green light in our universe - the only possible way to do it would be if something (e.g. a dust cloud?) was in between the star and us, and selectively absorbed the redder and bluer wavelengths that it emitted.