Letter to the Editor
Transient jets in V617 Sagittarii *
Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, 05508-900 São Paulo, SP, Brazil e-mail: email@example.com
2 IP&D, Universidade do Vale do Paraíba, Av. Shishima Hifumi, 2911, CEP 12244-000 São José dos Campos, SP, Brazil e-mail: firstname.lastname@example.org
3 SOAR Telescope, Casilla 603, La Serena, Chile
4 Laboratório Nacional de Astrofísica – LNA/MCT, Itajubá, MG, Brazil
Accepted: 6 June 2007
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.
Key words: stars: binaries: close / stars: neutron / stars: individual: V617 Sgr / stars: emission-line, Be
© ESO, 2007