Program: GN-2012A-DD-3

The enigmatic eclipsing binary, epsilon Aurigae, was observed last spring as part of GNIRS-SV-146, resulting in three excellent spectra showing the transient CO(2-0) spectrum associated with the dark disk causing the eclipse. Subsequent study of the data shows a symmetric feature at the isotopic 13CO bandhead, calling into question whether the system is evolved as previously claimed. One way to resolve this conundrum would be to obtain a single set of spectra during this post-eclipse season, wherein persistent features can be confidently identified and removed from the eclipse phase data. Total estimated time needed 0.5 hours.