AAS 199th meeting, Washington, DC, January 2002
Session 13. FUSE and Friends: New Results
Display, Monday, January 7, 2002, 9:20am-6:30pm, Exhibit Hall

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[13.05] Revised temperature scale of OB supergiants from FUSE and VLT-UVES spectroscopy

P.A. Crowther (University College London), D.J. Hillier (University of Pittsburgh), A.W. Fullerton (Johns Hopkins, Baltimore), O. De Marco (American Museum of Natural History, NY)

Four extreme Magellanic Cloud O supergiants, spanning O4 to O9.7, are analysed using Far-UV (FUSE), UV (HST/IUE) and visual (VLT-UVES) spectroscopy and sophisticated line blanketed model atmospheres. From UVES datasets, we find stellar temperatures which are substantially lower than previously derived (by 10--20%), which are supported particularly by FUSE datasets, with important consequences for derived masses and luminosities. All program supergiants show strong evidence for CNO processing from optical and far-UV diagnostics, whilst FUSE datasets imply that either phosphorus is deficient in the Magellanic Clouds relative to other heavy elements, or O stars winds are already clumped at very small radii.

The author(s) of this abstract have provided an email address for comments about the abstract: pac@star.ucl.ac.uk

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