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Color of globular clusters
http://forum.celestialmatters.org/viewtopic.php?f=2&t=986
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Author:  LukeCEL [ Tue, 03-12-19, 20:04 GMT ]
Post subject:  Color of globular clusters

Hi everyone.

I've always noticed that in Celestia 1.6.1, globular clusters appear to have a ring of green stars around them, between the bright yellowish cores and the outer blue stars. Is this correct?

Attachment:
globular.png
globular.png [ 444.96 KiB | Viewed 890 times ]


Thanks,
Luke

Author:  t00fri [ Tue, 03-12-19, 20:42 GMT ]
Post subject:  Re: Color of globular clusters

LukeCEL wrote:
Hi everyone.

I've always noticed that in Celestia 1.6.1, globular clusters appear to have a ring of green stars around them, between the bright yellowish cores and the outer blue stars. Is this correct?

Thanks,
Luke


No, Luke. There are no green stars in visual-star color schemes. Since I did both the globulars in Celestia and those in celestia.Sci I remember that with the SDSS colors (my standard DSO reference), greenish shades might well appear. To compare stars in different schemes you must always fold in the color scheme used and then transform it to some standard reference scheme.

Before coding the globulars I did many analytical studies via MAPLE. In celestia.Sci I further extended these studies and wrote a universal shader code for all stars (including halo stars around galaxies. globulars etc).

Good luck,
Fridger

Author:  LukeCEL [ Fri, 06-12-19, 4:31 GMT ]
Post subject:  Re: Color of globular clusters

Ah, thanks, Fridger. I had always thought that black bodies like stars could not have a spectrum that added up to a green color...

Thanks,
Luke

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