[7.13] Young, Massive Stars at Low Metallicity

AAS 200th meeting, Albuquerque, NM, June 2002
Session 7. Variable Stars and Relatives
Display, Monday, June 3, 2002, 9:20am-6:30pm, SW Exhibit Hall

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[7.13] Young, Massive Stars at Low Metallicity

S. R. Heap (NASA/GSFC), T. Lanz (U. MD/GSFC)

We report on an extensive analysis of O-type stars in the Small Magellanic Cloud that have been observed by HST and FUSE. The analysis, which involves detailed NLTE atmospheric models recently constructed by Lanz & Hubeny, has the following goals: (1) calibration of spectral properties in terms of fundamental parameters; (2) resolution of the discrepancy between spectro- scopic masses and evolutionary masses; and (3) evidence for mixing of nuclear-processed elements. We derive a significantly lower temperature scale for O-type stars than previously assumed; the lower temperatures help to resolve the ``mass discrepancy''. We describe the results of our analysis and discuss their implications for stellar evolution at low metallicity.

This work was supported by NASA ADP, HST GO and FUSE grants.

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