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N. R. Evans, P. Mendygral, J. Nichols (SAO), A. W. Fullerton (U. Victoria), D. Massa (SGT, Inc.), E. F. Guinan, E. Fitzpatrick (Villanova U.), I. Ribas (U. Barcelona)
A concerted effort has been made in recent years to obtain radial velocities and photometric light curves of the highest quality for eclipsing binaries in order to determine the masses and radii with high precision. Comparing these fundamental quantities with evolutionary tracks for as wide a mass range as possible is a direct test of evolutionary parameters (such as convective overshoot in the case of hot stars). We have begun a program of obtaining spectra of the hottest systems with the FUSE satellite in order to improve the temperature determination of these important stars. The first system studied is V380 Cyg, which has components B1.5 II-III and B2 V. The energy distribution has been fitted for visible and IUE wavelengths by Guinan, et al (2000, ApJ, 544, 409). We will compare the results from the FUSE spectrum with the previous temperature determination.
Funding for this investigation has been provided by Chandra contract NAS8-39073 and NASA Grant NNG04GM87G.
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Bulletin of the American Astronomical Society, 37 #2
© 2005. The American Astronomical Soceity.