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Definitely noise caused by heat.
Give Star Trails another go. I too notice exaggerated jagged edges while viewing the image within the program. But in a full res image, they aren't as bad.
Try doing 5 minute subs instead, with 1 second between shots.
You can try to clean up this image though, using the "dust and scratches" filter in Photoshop. A very small increment is all that should be needed, then fade it back if necessary.
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