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Color of milky way's starlight
If the center of the milky way galaxy (the 'core') has more population
II stars that are old and red, then that should make the galaxy appear more reddish when seen from somewhere far out like the Large or Small Magellanic Cloud. We aren't fortunate enough to be able to see it from there, but can CCDs record a redder tinge to the Milky way's diffuse starshine in the sky at night? Not sure if this been discussed before...? cheres (me dears)!!! S-S |
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Starlight-Starbright wrote:
If the center of the milky way galaxy (the 'core') has more population II stars that are old and red, then that should make the galaxy appear more reddish when seen from somewhere far out like the Large or Small Magellanic Cloud. We aren't fortunate enough to be able to see it from there, but can CCDs record a redder tinge to the Milky way's diffuse starshine in the sky at night? Not sure if this been discussed before...? cheres (me dears)!!! Here is a link to views of the Milky Way in many different wavelength ranges. The first one is a composite of color photographs, approximately the colors you would see if your eyes were more sensitive to dim light. http://astro.wsu.edu/worthey/astro/h...milky-way.html -- John Popelish |
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Starlight-Starbright wrote: If the center of the milky way galaxy (the 'core') has more population II stars that are old and red, then that should make the galaxy appear more reddish when seen from somewhere far out like the Large or Small Magellanic Cloud. We aren't fortunate enough to be able to see it from there, but can CCDs record a redder tinge to the Milky way's diffuse starshine in the sky at night? Not sure if this been discussed before...? cheres (me dears)!!! S-S Inverse square law: even if there are more "red' stars in one direction, the distance factor with the younger "bluer" stars being closer around here may cancel?? Jim G c'=c+v |
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In article . com,
"Starlight-Starbright" writes: If the center of the milky way galaxy (the 'core') has more population II stars that are old and red, then that should make the galaxy appear more reddish when seen from somewhere far out like the Large or Small Magellanic Cloud. You can get an idea from looking at spiral galaxies such as M31 or M81 (or indeed thousands of others). In visible light, the bulge is indeed typically redder than the disk, though not by a huge amount. The Milky Way's "diffuse starshine" as seen from Earth is in fact mostly light from individual stars in the magnitude range 8 to 10 (IIRC). These are mostly disk stars and on average a bit bluer than bulge stars, but they are also reddened by interstellar dust. I don't know what the average visible-light color turns out to be. If you extend your wavelength coverage to the infrared, you begin to penetrate the dust to great distances, the average reddening is high, and the average color is quite red. See the 2MASS or COBE depictions, for example. -- Steve Willner Phone 617-495-7123 Cambridge, MA 02138 USA (Please email your reply if you want to be sure I see it; include a valid Reply-To address to receive an acknowledgement. Commercial email may be sent to your ISP.) |
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