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Not sure if the 1100D has this "problem" but DSLRs aren't designed for astrophotography. As such there's no effort put into ensuring the sensor is cool, and in long exposure it heats up. This shows up as pink bleeding into the frame.
The higher the ISO the worse it is. I have seen the same thing on a much more expensive DSLR in a 45minute exposure at ISO200, and typically after about 5minutes at low ISO you start to see pink creeping in from the edges.
In short it's normal. Lower your ISO, or lower the shutterspeed and instead take multiple frames.
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