Time-dependent spectral-feature variations of stars displaying the B[e] phenomenon IV. V2028 Cygni: modelling of H alpha bisector variability
2018
Abstract
We present an alternative model of V2028 Cyg, a B[e] star of FS CMa type. The star V2028 Cyg is atypical among FS CMa stars due to its composite spectra of B4III and K2II-Ib type.
Our modelling of the temporal variability of the H alpha line bisectors indicates as the most probable model a geometrically and optically thick disc, which is surrounded by a dusty ring seen almost edge-on. This provides a possibility that the K-spectral component is formed in the disc.