Searching for Flaring Activity on the STAR Star Gamma CAS

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Hst Proposal Id #6086 Hot Stars

Scientific paper

Gamma Cas is one of the most active of the classical Be stars,showing pronounced optical emission lines as well as variableoptical, UV and X-ray continua. The X-ray variability is oftenassumed to be caused by the interaction of the stellar windwith a hypothetical degenerate companion. Recent evidence,however, suggests that the X-rays may be generated by flare-like activity originating in localized regions on the surfaceof the star (Smith, 1995). This interpretation is based on avariety of evidence, including FUV continuum variationsobserved with Voyager and transient emission and absorptionfeatures in various optical spectral lines seen from theground. The observations are far from conclusive, however. Inthe proposed observations we will use the GHRS to obtain highquality UV spectral time sequences, which will allow us totest the flare/active region hypothesis. Flares are commonlyassumed to be related to magnetic energy releases. If flaresand active regions are proven to exist on Be stars, it willhave a dramatic influence on the theoretical interpretation ofthe Be phenomena.

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