We present optical and infrared observations of the soft X-ray transient (SXT) XTE J2012+381 and identify the optical counterpart with a faint red star heavily blended with a brighter foreground star. The fainter star is coincident with the radio counterpart and appears to show weak Ha emission and to have faded between observations. The RXTE All Sky Monitor light curve of XTE J2012+381 is unusual for an SXT in that after an extended linear decay, it settled into a plateau state for about 40 days before undergoing a weak mini-outburst. We discuss the nature of the object and suggest similarities to long orbital period SXTs.
Publication Source (Journal or Book title)
Monthly Notices of the Royal Astronomical Society
Hynes, R., Roche, P., Charles, P., & Coe, M. (1999). The X-ray transient XTE J2012+381. Monthly Notices of the Royal Astronomical Society, 305 (3) https://doi.org/10.1046/j.1365-8711.1999.02653.x