The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039 (2009)
Aragona, Christina, McSwain, M. Virginia, Grundstrom, Erika D., Marsh, Amber N., Roettenbacher, Rachael M., Hessler, Katelyn M., ...
LS I +61 303 and LS 5039 are two of only a handful of known high mass X-ray binaries (HMXBs) that exhibit very high energy emission in the MeV-TeV range, and these "gamma-ray binaries" are of renewed...
Detection of a Hot Subdwarf Companion to the Be Star FY Canis Majoris (2008)
Peters, Geraldine J., Gies, Douglas R., Grundstrom, Erika D., McSwain, M. Virginia
The rapid rotation of Be stars may be caused in some cases by past mass and angular momentum accretion in an interacting binary in which the mass donor is currently viewed as a small, hot subdwarf...
The B and Be star population of NGC 3766 (2008)
McSwain, M. Virginia, Huang, Wenjin, Gies, Douglas R., Grundstrom, Erika D., Townsend, Richard H.D.
We present multiple epochs of Hα spectroscopy for 47 members of the open cluster NGC 3766 to investigate the long-term variability of its Be stars. Sixteen of the stars in this sample are Be stars,...
The B and Be Star Population of NGC 3766 (2007)
McSwain, M. Virginia, Huang, Wenjin, Gies, Douglas R., Grundstrom, Erika D., Townsend, Richard H. D.
We present multiple epochs of H-alpha spectroscopy for 47 members of the open cluster NGC 3766 to investigate the long term variability of its Be stars. Sixteen of the stars in this sample are Be...
Runaway Massive Binaries and Cluster Ejection Scenarios (2006)
McSwain, M. Virginia, Ransom, Scott M., Boyajian, Tabetha S., Grundstrom, Erika D., Roberts, Mallory S. E.
The production of runaway massive binaries offers key insights into the evolution of close binary stars and open clusters. The stars HD 14633 and HD 15137 are rare examples of such runaway systems,...
Estimating Be Star Disk Radii using H-alpha Emission Equivalent Widths (2006)
Grundstrom, Erika D., Gies, Douglas R.
We present numerical models of the circumstellar disks of Be stars, and we describe the resulting synthetic H-alpha emission lines and maps of the wavelength-integrated emission flux projected onto...
A Spectroscopic Study of Field and Runaway OB Stars (2006)
McSwain, M. Virginia, Boyajian, Tabetha S., Grundstrom, Erika D., Gies, Douglas R.
Identifying binaries among runaway O- and B-type stars offers valuable insight into the evolution of open clusters and close binary stars. Here we present a spectroscopic investigation of 12 known or...