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Multiwavelength Observations of the Runaway Binary HD 15137
M. Virginia McSwain, Michael De Becker, Mallory S. E. Roberts +6
HD 15137 is an intriguing runaway O-type binary system that offers a rare opportunity to explore the mechanism by which it was ejected from the open cluster of its birth. Here we p…
The Ultraviolet Spectrum and Physical Properties of the Mass Donor Star in HD 226868 = Cygnus X-1
S. M. Caballero-Nieves, D. R. Gies, C. T. Bolton +8
We present an examination of high resolution, ultraviolet spectroscopy from Hubble Space Telescope of the photospheric spectrum of the O-supergiant in the massive X-ray binary HD 2…
Variability of Be Stars in Southern Open Clusters
M. Virginia McSwain, Wenjin Huang, Douglas R. Gies
We recently discovered a large number of highly active Be stars in the open cluster NGC 3766, making it an excellent location to study the formation mechanism of Be star disks. To…
Tomographic Separation of Composite Spectra. XI. The Physical Properties of the Massive Close Binary HD 100213 (TU Muscae)
Laura R. Penny, Cynthia Ouzts, Douglas R. Gies
We present the results of a Doppler tomographic reconstruction of the UV spectra of the double-lined, O binary HD 100213 based on observations made with the International Ultraviol…
A FUSE Survey of the Rotation Rates of Very Massive Stars in the Small and Large Magellanic Clouds
Laura R. Penny, Douglas R. Gies
We present projected rotational velocity values for 97 Galactic, 55 SMC, and 106 LMC O-B type stars from archival FUSE observations. The evolved and unevolved samples from each env…
The Evolutionary State of the Massive Interacting Binary BD+36 4063
S. J. Williams, D. R. Gies, R. A. Matson +1
We present a spectroscopic and photometric analysis of the remarkable massive binary system, BD +36 4063. We argue that the visible ON star is undergoing a rapid mass transfer epis…