red flickering of star?

by Johnahh
Tags: flickering, star
Johnahh is offline
Jan14-12, 12:18 PM
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so I was just looking up at the sky, as you do...
and I noticed one star was flickering red, I believe it was betelgeuse - as far as i could see on my sky map app.
Could any one tell me the reasoning for this flickering? as none of the other stars visible were doing this - at least as far as i could tell.

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KrisOhn is offline
Jan14-12, 12:23 PM
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How close was it to the horizon? If star light has to pass through lots of horizon before it gets to you the range of flickering will be much greater than a star above it.
Johnahh is offline
Jan14-12, 12:28 PM
P: 84
At least 45 Degrees above the horizon.

KrisOhn is offline
Jan14-12, 01:17 PM
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red flickering of star?

Even at that height, this flickering would just be atmospheric effects.
chemisttree is offline
Jan14-12, 01:28 PM
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Betelgeuse is pretty bright too. Flickering is much harder to discern with dimmer stars. You will see the flickering of the dimmer stars through a telescope.
Johnahh is offline
Jan14-12, 01:30 PM
P: 84
Although this makes sense i'm still a little confused. Stars that are closer to the horizon and stars that are near the star in question do not have this flickering?

Edit:@chemisttree - ok that makes sense now, your reply was posted while typing mine. :)

Drakkith is online now
Jan14-12, 05:09 PM
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Take a look at Sirius just after it becomes visible. It looks like police lights, going from red to blue to white and everything in between thanks to the atmosphere when it's low on the horizon.
Waterfox is offline
Jan15-12, 05:22 AM
P: 33
Funny, I was looking at Betelgeuse a few nights ago and wondered the exact same thing.
Johnahh is offline
Jan15-12, 05:40 AM
P: 84
Thanks for your replies everyone.
I shall be sure to check Sirius out :)

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