1998A&A...331L..53P

High-resolution echelle spectra of the FUor V1057 Cyg were taken during its minimum brightness in 1996-97. The spectra show the appearance of strong shell-components in the lines of low excitation, an increase of the splitting of the photospheric absorption lines, and the appearance of weak emission lines. It is argued that the mysterious line splitting of the absorption lines in the spectrum of V1057 Cyg, which has been interpreted as originating from an accretion disk, can be explained simply by the presence of central emission cores in the broad absorption lines. This emission spectrum of V1057 Cyg has increased in strength relative to the continuum as the star has faded.