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The stars are very contrast objects. Way more contrast than ordinary photographic optics can handle. Moreover, any lens is producing some CA. Astronomical telescopes are just tuned specifically to minimize it as much as possible. It has never been on agenda for ordinary photographic optics - as it has different more important priorities. So, some CA is ok. Also,digital photographic matrix is able to produce effects very similar to CA - the difference is it's one-color one-sided as opposite two-color two sided "true" CA. there's a way to deal with it - you will need an image management program that's able to handle color fringing. Adobe Lightroom is one of them.
Your camera was lucky to survive your direct sun shot this time. Please take care not to test it again - use a proper solar filter. they are expensive, but much cheaper tha a new DSLR body.
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