The cataclysmic variable V751 CYG at the eye of the pelican nebula: evidence of a circumstellar ring?

摘要

Spectroscopic echelle observations of V751 Cygni and its nearby surroundings are presented here. Although long-slit observations show the presence of variable emission in the material around the object, the temperature and densities derived from [O II], [S II] lines suggest that this material comes from the background and is not connected with the cataclysmic variable. An analysis of the radial velocity of the Hα line gives an orbital period of 0.144584 days.