On the triple nature of the X-ray source 4U2129+47 (= V1727 Cyg)

M. S. Bothwell, M. P. Torres, M. R. Garcia +1

Context. In quiescence, the proposed optical counterpart to the neutron star low mass X-ray binary 4U 2129+47 (V1727 Cyg) shows a spectrum consistent with a late F-type subgiant an…