Letter to the Editor

Transient jets in V617 Sagittarii ^*

¹ Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, 05508-900 São Paulo, SP, Brazil e-mail: steiner@astro.iag.usp.br
² IP&D, Universidade do Vale do Paraíba, Av. Shishima Hifumi, 2911, CEP 12244-000 São José dos Campos, SP, Brazil e-mail: alexandre@univap.br
³ SOAR Telescope, Casilla 603, La Serena, Chile
⁴ Laboratório Nacional de Astrofísica – LNA/MCT, Itajubá, MG, Brazil

Received: 11 May 2007
Accepted: 6 June 2007

Abstract

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.