A Mysterious Twin of Epsilon-Aurigae

With 436 dedicated papers, Epsilon Aurigae is probably the most extensively
studied star in the sky (besides our Sun). It goes into a 2-year eclipse every
27.1 years. It is suggested that the system consists of a yellow supergiant,
and a mysterious companion enshrouded by a huge opaque disk extended to a few
AU. Thus far, Epsilon Aurigae has been the only such system, and its
evolutionary history is still unclear. Here I present our recent discovery of
a mysterious twin of Epsilon-Aurigae from DASCH. It showed a 4 mag decline
which lasted for 3 years in 1940s, and now, 68 years later, is at decline
phase again. The magnitude changes in optical and NIR bands are comparable,
indicating opaque bodies are blocking the light rather than dust extinction.
We suggest that it is an eclipsing binary system, similar to Epsilon-Aurigae,
probably caught in a short stage in binary evolution. I will describe the
DASCH discovery data, our current follow-up observations, and a model for the
system and its evolution.