I love Aludra. It does sound alluring and the reference to the star is lovely. If I used it I would skip the nickname Allie, though, and go with Lu or Lulu. I think it's slightly more interesting and appropriate, given the sound of the name.
I agree that Lu and Lulu would serve better as nicknames for Aludra than Allie. I wish I liked Lu and Lulu more, but I've never been overly fond of them for people. I like them for pets, though. My dog is named Lucinda "Lucy", and I call her Lu here and there.