AAS 195th Meeting, January 2000
Session 76. Geometrically Variable Stars
Display, Friday, January 14, 2000, 9:20am-6:30pm, Grand Hall

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[76.10] A New Orbit For The Massive Binary HD 199579

A.M. Williams (Georgie State Universtiy), D.R. Gies, D.H. Berger, P.A. Erling (Georgia State University), J.A. Harvin (Georgie State University), W.J. Huang, W.C. Jao, J.P. McFarland, D.J. Wallace, T. Fallon, W.G. Bagnuolo, R.L. Riddle, M.V. McSwain, T. Josephs, D.W. Wingert (Georgia State University), A.W. Fullerton (University of Victoria)

We present new radial velocity data for the massive binary, HD 199579 (O6 Ve), a member of the Cyg OB7 association, using spectra obtained form IUE, CFTH, KPNO, and the GSU Multiple-Telescope Telescope. We derive a revised period, P = 48.520 ± 0.003 d, and new orbital elements. There is some evidence of a faint secondary component (probably an early B-star) in the He I 5876 Åline and IUE cross-correlation functions obtained near the velocity extremes. HD 199579 is probably representaive of a significant fraction of massive binaries with large mass ratios and faint companions.

The author(s) of this abstract have provided an email address for comments about the abstract: williams@chara.gsu.edu

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