Transient jets in V617 Sagittarii

Context.Some of the luminous Compact Binary Supersoft X-Ray sources (CBSS) have shown indications of jets, also called satellites due to their appearance in the spectra. In V Sagittae (V Sge) stars, the galactic counterparts of the CBSS, such features have been reported only for WX Cen. Aims.If V Sge stars are indeed the analogs of CBSS, one may expect transient jet emission in other objects of this class. Methods.Spectroscopic observations of the V Sge star V617 Sgr have been made, both at high photometric state and at decline. Results.We show that V617 Sgr presents Hα satellites at high photometric state with velocities of ±780 km s-1. Conclusions.This feature confirms, once more, the CBSS nature of the V Sge stars, however the details of the spectral characteristics also suggest that the two groups of stars display some intrinsic spectroscopic differences, which are likely to be due to a selection effect related to chemical abundance.