DELLA VALLE, MassimoMassimoDELLA VALLEJarvis, B. J.B. J.JarvisWest, R. M.R. M.West2022-09-282022-09-2819910004-6361http://hdl.handle.net/20.500.12386/32662The optical counterpart of the new transient X-ray source, GRS 1121-68, Nova Muscae 1991, has been identified. The optical position, the optical lightcurve, and two early-stage flux calibrated spectra are reported. The available data support the binary nature of Nova Muscae 1991. Similarity with A0620-00 in its early evolutionary stages suggests that Nova Muscae 1991 is a possible black hole candidate.STAMPAenArticlehttps://ui.adsabs.harvard.edu/abs/1991A%26A...247L..33D/abstract1991A&A...247L..33DFIS/05 - ASTRONOMIA E ASTROFISICA