Thanks! I think there are over 6000 cataloged now. We have looked at only a few serendipitously where they just happen to fall in survey
areas. No such tail on those. It begs for someone to do a methodical study.
The fact that Mira is the nearest AGB star and it has a tail suggests that there are lots of these things waiting to be discovered. It does require two things - a mass shedding star and a high enough velocity to generate a bow shock. So that will cut the number down, but AGB stars are older stars often associated with the thick disk of the galaxy and therefore typically have higher velocities than your average thin disk star.
You can propose to use GALEX. Would be a good project.
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