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The High Angular Resolution Multiplicity of Massive Stars
Brian D. Mason, William I. Hartkopf, Douglas R. Gies +2
We present the results of a speckle interferometric survey of Galactic massive stars that complements and expands upon a similar survey made over a decade ago. The speckle observat…
First Resolved Images of the Eclipsing and Interacting Binary Beta Lyrae
M. Zhao, D. Gies, J. D. Monnier +12
We present the first resolved images of the eclipsing binary Beta Lyrae, obtained with the CHARA Array interferometer and the MIRC combiner in the H band. The images clearly show t…
A Spectroscopic Orbit for Regulus
D. R. Gies, S. Dieterich, N. D. Richardson +8
We present a radial velocity study of the rapidly rotating B-star Regulus that indicates the star is a single-lined spectroscopic binary. The orbital period (40.11 d) and probable…
Detection of a Hot Subdwarf Companion to the Be Star FY Canis Majoris
Geraldine J. Peters, Douglas R. Gies, Erika D. Grundstrom +1
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 sma…
Angular Diameters of the G Subdwarf Cassiopeiae A and the K Dwarfs Draconis and HR 511 from Interferometric Measurements with the CHARA Array
Tabetha S. Boyajian, Harold A. McAlister, Ellyn K. Baines +13
Using the longest baselines of the CHARA Array, we have measured the angular diameter of the G5 V subdwarf Cas A, the first such determination for a halo population star. We co…
Dynamical Masses for the Large Magellanic Cloud Massive Binary System [L72] LH 54-425
S. J. Williams, D. R. Gies, T. J. Henry +8
We present results from an optical spectroscopic investigation of the massive binary system [L72] LH~54-425 in the LH 54 OB association in the Large Magellanic Cloud. We revise the…