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$\begingroup$ Is it actually green? Space photos are often colourised to represent different wavebands, and I couldn't find mention of actual colour on linked wiki, nor pages linked to by wiki. $\endgroup$
– M i ech
Commented Dec 12, 2016 at 15:32
23

$\begingroup$ @Miech It's actually green, yes. It's not a false-color image. $\endgroup$
– HDE 226868 ♦
Commented Dec 12, 2016 at 15:33
2

$\begingroup$ NGC 6826 is difficult to observe in a telescope; when you look directly at it, the central star overwhelms the light from the nebula, so it takes careful observation with averted vision to see the nebula (and that means you see it in grey scale, not green). Observation from nearby is problematic as well--O III is caused by intense ultraviolet radiation stripping away electrons from oxygen. Being close to that amount of ultraviolet would be unhealthy, to say the least. OTOH, we're probably getting into an area that's pretty easy to ignore/handwave. $\endgroup$
– Jerry Coffin
Commented Dec 12, 2016 at 19:10
6

$\begingroup$ It's worth noting that Copper also does this in a less vibrant 510nm green, but also emits gold at 578.2nm. Together they produce some electric green colors. However, oxygen will be the brightest green to human eyes, as we're most sensitive to green at 555nm. The effeciency of copper-light conversion is usually much, much higher than oxygen, however. $\endgroup$
– tuskiomi
Commented Dec 12, 2016 at 20:23
1

$\begingroup$ So, the point of this answer, is that green stars are a breath of fresh air. $\endgroup$
– Justin Time - Reinstate Monica
Commented Dec 14, 2016 at 5:00

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