Spectrographic observations of the peculiar Be star with infrared excess HD 45677.

Summary. We present the following spectrographic information concerning the peculiar Be star HD 45677 (B2e, mv 8.5): - the forbidden emission lines ([0 1], [S ii], [Fe ii], [Ni ii], [Cr ii], ...) are single and sharp; - the double emission lines of permitted Fe ii seem to originate in a thin equatorial ring well separated from the stellar photo sphere; - The Ti H, Mn ii and Cr ii lines appear as very broad (or double) emissions with a central sharp absorption (shell or thick ring); the Fe ii profiles were similar to those of the metallic lines in the 1940's but have evolved differently since; - the stellar Mg ii absorption line 4481 and the circumstellar Ca ii K line are shown to be variable; - the complex structure of H, and H6 (P Cygni with several emission- and absorption components over a wide shallow absorption) varies from night to night; - in the course of a single night, the profiles of H and H6 varied on a time scale of about two hours, one absorption component disappearing completely. A line list covering the region 3100-8700 A is given, together with a comparison between some emission lines present in HD 45677 and in other peculiar objects, such as Carinae or LkH 101. Key words: HD 45677 - Bep stars - spectral variations - line profiles