Nonradial oscillations of the Be star Gamma Cassiopeiae

Details Nonradial oscillations of the Be star Gamma Cassiopeiae Nonradial oscillations of the Be star Gamma Cassiopeiae

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..233y&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Feb. 1988, p. 233-242. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

29

B Stars, Line Spectra, Stellar Oscillations, Shell Stars, Spaceborne Astronomy, Stellar Flares, Time Series Analysis, X Ray Sources

Scientific paper

Subfeatures < 0.5% of continuum were detected moving through the line profiles of the Be/shell star γ Cas over a nine-month period in 1983. While the average spacing and acceleration of the subfeatures is consistent with nonradial pulsation of |m| = 12±4, large variations in the acceleration of the subfeatures are sometimes seen and some subfeatures appear and disappear suddenly. The observed period of the subfeature oscillations varies between 7000 and 10,000 seconds which is similar to the transient 6000-second variation in X-ray flux by EXOSAT in December 1984. No rapid E/C variation is observed in the Hγ and He I λ5876 emission-line profiles.

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