We present a direct image of the innermost companion to the red giant delta Andromedae using the Stellar Double Coronagraph at the Palomar Observatory. We use a Markov chain Monte Carlo based algorithm to simultaneously reduce the data and perform astrometry and photometry of the companion. We determine that the companion is most likely a main-sequence K-type star and is certainly not the previously hypothesized white dwarf.
Cite
@article{arxiv.1506.07517,
title = {Resolving the delta Andromedae spectroscopic binary with direct imaging},
author = {Michael Bottom and Jonas Kuhn and Bertrand Mennesson and Dimitri Mawet and Jean C. Shelton and J. Kent Wallace and Eugene Serabyn},
journal= {arXiv preprint arXiv:1506.07517},
year = {2015}
}