Abstract
Unusual activity of outflow mass motion connected with infall events was recorded for the B0.5 IVe star FY CMa in February 1987 from both archival IUE spectrograms of circumstellar Nv resonance lines and optical spectra of H and Hei 5876˚ emission lines which showed inverse P Cygni-type profiles. We estimate the mass loss rate using ultraviolet Siivresonance lines with expanding atmosphere modeling calculations, and describe how the radial pressure performs the dominant role in accelerating the stellar wind. We attempt to give a qualitative explanation for the activity observed for FY CMa in terms of circumstellar matter raining down to the star.
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