The interacting binary system W Serpentis was observed at the CTIO 1.52m telescope, with the BME spectrograph, from June 26 through July 1, 1991, through the phase interval 0.93P - 0.28P. The spectral region AA5510-6980 Å was covered. The spectra show the following behavior: a) Hα is the most prominent emission present, b) He I λ5876 emission is present on all the spectra, c) Na I, Si II, Fe II and Ba II are present as variable emissions, d) [Fe II] and [O I] emissions are possibly present, e) narrow and associated variable shallow absorption of Na I, Si II, Sc II and Fe II are present, f) shallow and variable absorption of Ca I and Fe I are present, g) diffuse interstellar absorptions are present, and suggest E(B — V) ∼ 0.5.Asociación Argentina de Astronomí
