180 citations · 1.1k across the 17 of their papers we have counts for
15 papers
Radial Velocities of Galactic O-Type Stars. II. Single-lined Spectroscopic Binaries
S. J. Williams, D. R. Gies, T. C. Hillwig +2
We report on new radial velocity measurements of massive stars that are either suspected binaries or lacking prior observations. This is part of a survey to identify and characteri…
The Be Star HD 215227: A Candidate Gamma-ray Binary
S. J. Williams, D. R. Gies, R. A. Matson +4
The emission-line Be star HD 215227 lies within the positional error circle of the newly identified gamma-ray source AGL J2241+4454. We present new blue spectra of the star, and we…
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…
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…
Stellar Rotation in Field and Cluster B-Stars
Wenjin Huang, Douglas R. Gies
We present the results of a spectroscopic investigation of 108 nearby field B-stars. We derive their key stellar parameters, , , , and $\log g_{\rm p…
Stellar Wind Variations During the X-ray High and Low States of Cygnus X-1
D. R. Gies, C. T. Bolton, R. M. Blake +10
We present results from Hubble Space Telescope UV spectroscopy of the massive X-ray binary system, HD226868 = Cyg X-1. The spectra were obtained at both orbital conjunction phases…