Infall and Outflow Activities in the Be star FY CMa

Details Infall and Outflow Activities in the Be star FY CMa Infall and Outflow Activities in the Be star FY CMa

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001chjaa...1..514c&link_type=abstract

Chinese Journal of Astronomy & Astrophysics, Vol. 1, pp. 514-524

Astronomy and Astrophysics

Astrophysics

3

Line: Profiles, Stars: Activity, Stars: Emission-Line, Be, Circumstellar Matter, Stars: Mass-Loss, Ultraviolet:Stars

Scientific paper

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 N resonance lines and optical spectra of Hα and He λ5876 Å emission lines which showed inverse P Cygni-type profiles. We estimate the mass loss rate using ultraviolet Si resonance 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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