Timeline for What could make a star green?
Current License: CC BY-SA 4.0
20 events
| when toggle format | what | by | license | comment | |
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| Jun 16, 2020 at 11:03 | history | edited | CommunityBot |
Commonmark migration
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| Apr 30, 2019 at 13:54 | history | edited | HDE 226868♦ | CC BY-SA 4.0 |
Miscellaneous edits.
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| Jan 9, 2017 at 19:24 | history | edited | HDE 226868♦ | CC BY-SA 3.0 |
Explained the mechanism at work.
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| Dec 15, 2016 at 15:57 | comment | added | CR Drost | I'm pretty sure that the mathematics don't actually work out, but it would be really interesting if a blue star could be so massive that its light gets gravitationally redshifted back to green. (I'm not so worried about collapse to a black hole as you might be able to get it spinning with the Kerr metric, it's more the question of, if you take a blue blackbody spectrum and redshift it, does it ever come back as green, which seems unlikely.) | |
| Dec 15, 2016 at 15:31 | comment | added | automaton | Another problem - the reason there isn't much gas and dust around our solar system (and presumably others) anymore is that once a protostar "solidifies" into a true star, the relatively thick gas and dust that didn't coalesce into planets or rocky materials (e.g. asteroids, meteoroids) were swept away by solar winds | |
| Dec 15, 2016 at 13:01 | vote | accept | Zxyrra | ||
| Dec 14, 2016 at 15:15 | history | edited | Josh King | CC BY-SA 3.0 |
fixed typo
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| Dec 14, 2016 at 13:01 | comment | added | HDE 226868♦ | @AngeloFuchs I'm not surrounding the star with a nebula, just a cloud of gas with a composition similar to that of these nebulae. | |
| Dec 14, 2016 at 6:14 | comment | added | Angelo Fuchs | This nebulae is ~12000 AU large. A planet orbiting this star would not see a green star. Instead all surrounding space would have a (VERY!) dim green hue. | |
| Dec 14, 2016 at 5:00 | comment | added | Justin Time - Reinstate Monica | So, the point of this answer, is that green stars are a breath of fresh air. | |
| Dec 13, 2016 at 20:06 | comment | added | Wossname | This image reminds me of Melllvar. | |
| Dec 13, 2016 at 20:06 | comment | added | NeutronStar | Oxygen for the win! | |
| Dec 12, 2016 at 20:36 | comment | added | Thorsten S. | Excellent answer. I was also thinking of wrapping the star into a cloud, but did not knew oxygen was a candidate. | |
| Dec 12, 2016 at 20:23 | comment | added | tuskiomi | 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. | |
| Dec 12, 2016 at 19:10 | comment | added | Jerry Coffin | 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. | |
| Dec 12, 2016 at 15:46 | history | edited | HDE 226868♦ | CC BY-SA 3.0 |
Discussed mass loss and sustainability.
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| Dec 12, 2016 at 15:33 | comment | added | HDE 226868♦ | @Miech It's actually green, yes. It's not a false-color image. | |
| Dec 12, 2016 at 15:32 | history | edited | HDE 226868♦ | CC BY-SA 3.0 |
added 197 characters in body; added 200 characters in body
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| Dec 12, 2016 at 15:32 | comment | added | M i ech | 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. | |
| Dec 12, 2016 at 15:28 | history | answered | HDE 226868♦ | CC BY-SA 3.0 |