Spectro-Interferometric Observations of Interacting Massive Stars with VEGA/CHARA

摘要

We obtained spectro-interferometric observations in the visible of β Lyrae and υ Sgr using the instrument VEGA of the CHARA interferometric array. For β Lyrae, the dispersed fringe visibilities and differential phases were obtained in spectral regions containing the Ha and He I 6678 lines and the H β and He I 4921 lines. Whereas the source is unresolved in the continuum, the source of the emission lines is resolved and the photocenter of the bulk of the H_α emission exhibits offsets correlated with the orbital phase. For v Sgr, both the continuum and H_α sources are resolved, but no clear binary signal is detected. The differential phase shift across the line reveals that the bulk of the H_α emission is clearly offset from the primary.