Rotating Star
Posted on Sunday, July 26, 2009 in Photography
what kind of star flashes brilliantly between 2 colors, like red and blue?
i have seen at least 2 of these and another similar phenomena where a star flashes brilliantly for several seconds then twinkles more normally for several seconds, then back. When i tried to find out about this, i found mention of oscillating stars, but the cycles are much longer, like weeks. i read about double stars which seems to be likely, but the changes are caused by the two stars rotating around each other, making one in front of the other at different times. But no stars rotate around each other in seconds. So has anyone heard of this phenomena? tell me what its called so i can go read about it. Thanks for all your thoughtful answers.
Your observation is keen. Stars, as observed, do often flash blue and red. However, any pin-point of white light originating from space and observed from earth will flash.
The flashing is caused by earth's oscillating atmosphere. Consider that earth's atmosphere has waves much like the ocean's waves. As the white light enters the wavy atmosphere, it is both diffracted and refracted. The effects are not as extreme as that which you may observe from under water, so larger objects like the planets or the sun don't appear to be twinkling. However, given the distances of the stars, their observed magnitude is pinpoint.
The atmosphere acts like a wobbling prism to change the star's appearance. One will observe the blue light, the atmosphere is jiggling, and suddenly the refraction pattern delivered to the same point of observation is the red side of the spectrum.
Whats On My YouTube Today?
Time Lapse Sky Shows Earth Rotating Instead of Stars
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