FY Canis Majoris
Abstract
G. J. Peters, Space Sciences Center, University of Southern California, writes: "The spectrum of the Be star FY CMa (HR 2855) has undergone a striking change in just 12 days. Observations with the Coude Feed Telescope (+ TI3 CCD) at Kitt Peak National Observatory reveal that between Apr. 20 and May 2 the violet lobe of the centrally-reversed H-alpha feature increased in strength by 35 percent (violet, red lobe intensities with respect to continuum: I(V)/I(cont) about 2.5, I(R)/I(cont) about 1.8), while He I (667.8 nm), which previously displayed a simple absorption profile with very weak double emission, developed a structured, inverse P-Cyg profile with a violet emission lobe of about 1.2 I(cont) and a central core (velocity about -70 km/s). Steady nightly variations were seen in the He I feature through May 6. Further observations are urged during the next few weeks before the star becomes unobservable for the season."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- May 1987
- Bibcode:
- 1987IAUC.4391....2P