So the newest theory is that the F-star in epsilon Aurigae system is actually not a true super giant but a relatively light, but still huge, "post-AGB" star.
What I don't understand: Aren't Post-AGB stars usually associated with "Proto-Plantetary Nebulae"? (PPN), which I understand are a special kind of relection nebulae? Given the distance to eps Aur and its luminosity, wouldn't it be possible to actually image the PPN from Earth? Are there Post-AGB-stars without PPNs?