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My thoughts on auto white balance are that it may not be that desirable. Why? Well, even auto has to use some value for the white point, and it may change between images as you have not forced it to one specific temperature. Setting it to sunny for example, or even a specific temperature point if your camera supports it, will use a consistent value for all images.
Years ago when the DSLRs were just making it into use for astro work, some of the more prominent members of the astro imaging community advocated using "sunny". I'm not sure on the reason, most likely it was due to that being a temperature in the middle of the range and therefore the least likely to result in false colour. I'll have to check my archives.
Of course you can override white balance in your RAW conversion process to use the same value for all images,
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