2FGL J0846.0+2820: A new neutron star binary with a giant secondary and variable $\gamma$-ray emission

Samuel J. Swihart, Jay Strader, Tyrel J. Johnson +11

We present optical photometric and spectroscopic observations of the likely stellar counterpart to the unassociated \emph{Fermi}-Large Area Telescope (LAT) $\gamma$-ray source 2FGL J084…