A search for gamma Cas analogs at low metallicity

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Hst Proposal Id #10234 Hot Stars

Scientific paper

Extensive studies of Be stars in the Milky Way {MW}, from optical to X-Ray wavelengths, showed that this class of objects gives important clues to our understanding of issues of broad relevance, among them the dynamo mechanism, stellar evolution {single/binary}, circumstellar disks, variability and mechanisms for X-ray emission. Moreover, the classical prototype {from optical studies} of this class, gamma Cas, has turned out to be unique in its X-ray properties. Can we find gamma Cas analogs in other galaxies? How does the Be phenomenon depend on metallicity ? We propose to extend the study of Be stars to the low metallicity Small Magellanic Cloud {SMC}. We selected a small, exploratory but significant, sample of Be stars detected from our extensive ground-based surveys. Because many crucial properties can only be measured in the UV, we propose to obtain STIS UV spectra to complement our data at other wavelengths {ground-based, including light curves and Halpha, and X-rays} , in order to: {1} characterize the SMC counterpart of the Be class, so far only {and extensively} studied in the UltraViolet in the MW, in the parameter space Teff, Lbol, mass loss, and {2} perhaps detect analogs of the hitherto unique object gamma Cas.

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