Recent unusual activity in the Be star FY Canis Majoris

Details Recent unusual activity in the Be star FY Canis Majoris Recent unusual activity in the Be star FY Canis Majoris

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331l..33p&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. L33-L36.

Astronomy and Astrophysics

Astrophysics

13

B Stars, H Alpha Line, Stellar Activity, Stellar Envelopes, Stellar Mass Ejection, Ultraviolet Spectra, Absorption Cross Sections, Charge Coupled Devices, Cygnus Constellation, Line Spectra

Scientific paper

Unusual activity observed in the circumstelar envelope of FY CMa during April-May, 1987 is reported. Nightly CCD observations from April 16-20 revealed an invariant H-alpha emission feature and a simple absorption profile for He I 6678 with very weak double emission components. Similar observations on May 2, however, showed that the V lobe of the H-alpha feature had increased in strength by 30 percent and that the He I line had developed into a structured inverse P Cygni profile.

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