78 citations · 208 across the 14 of their papers we have counts for
15 papers
The Hot, Continuum-compact State of the Yellow Hypergiant V509 Cassiopeiae: CHARA Diameters, CO-band Angular-extension Constraints, and Companion Limits
Narsireddy Anugu, Gail H. Schaefer, Douglas R. Gies +4
Yellow hypergiants are rare, evolved massive stars generally interpreted as post-red-supergiant objects evolving blueward through or near the dynamically unstable Yellow Evolutiona…
CHARA Array Observations of the Evolved Components in Symbiotic Star Systems
Thomas Martin Gaudin, Ryan Norris, Magdalena Otulakowska-Hypka +30
The nature of the mechanisms that drive mass transfer in symbiotic stars remains an area of active research in stellar astronomy. Constraining the role that both stellar winds and…
Visual Orbits of Spectroscopic Binaries with the CHARA Array. V. HD 210763 and HD 221950
Kathryn V. Lester, Josephine Singleton, Alexandra M. Twomey +16
We present the visual orbits and dynamical masses of two longer period spectroscopic binary stars, HD 210763 and HD 221950, using long baseline interferometry with the CHARA Array…
Empirical H- and K-band Limb Darkening for 31 CHARA Stars: A Near-Infrared Benchmark for Stellar-Atmosphere Models
Narsireddy Anugu, John D. Monnier, Antoine Mérand +9
Limb darkening, the decrease in stellar intensity from the disk center to the limb, encodes the temperature structure and opacity of stellar atmospheres. Direct spatially resolved…
Pre-nova Observations of T CrB: A view from the CHARA Array
Ryan Norris, Narsireddy Anugu, Thomas Gaudin +38
T CrB is a symbiotic recurrent nova consisting of a red giant and white dwarf with recent eruptions in 1866 and 1946 and an anticipated eruption in the mid 2020s. We report CHARA A…
Parameter-Free Dynamic Regret for Unconstrained Linear Bandits
Alberto Rumi, Andrew Jacobsen, Nicolò Cesa-Bianchi +1
We study dynamic regret minimization in unconstrained adversarial linear bandit problems. In this setting, a learner must minimize the cumulative loss relative to an arbitrary sequ…
Detection and Astrometry of the Ba-Bb Subsystem in Piscium: First Dual-Field Interferometry at the CHARA Array
Narsireddy Anugu, Robert Klement, John D. Monnier +14
We present the first on-sky demonstration of dual-field interferometry at the CHARA Array and the first direct resolution of the inner Ba--Bb subsystem in the bright hierarchical t…
Angular Sizes and Effective Temperatures of O-type Stars from Optical Interferometry with the CHARA Array
Kathryn D. Gordon, Douglas R. Gies, Gail H. Schaefer +3
We present interferometric observations of six O-type stars that were made with the Precision Astronomical Visible Observations (PAVO) beam combiner at the Center for High Angular…
Kepler Eclipsing Binaries with Stellar Companions
D. R. Gies, R. A. Matson, Z. Guo +3
Many short-period binary stars have distant orbiting companions that have played a role in driving the binary components into close separation. Indirect detection of a tertiary sta…
The Optical Wind Line Variability of Carinae During the 2009.0 Event
Noel D. Richardson, Douglas R. Gies, Theodore R. Gull +2
We report on high-resolution spectroscopy of the 2009.0 spectroscopic event of Carinae collected via SMARTS observations using the CTIO 1.5 m telescope and echelle spectrograph…
The H-alpha Variations of the Luminous Blue Variable P Cygni: Discrete Absorption Components and the Short S Doradus Phase
Noel D. Richardson, Nancy D. Morrison, Douglas R. Gies +3
P Cygni is a prototype of the Luminous Blue Variables (or S Doradus variables), and the star displays photometric and emission line variability on a timescale of years (known as th…
HD 69686: A Mysterious High Velocity B Star
Wenjin Huang, Douglas R. Gies, M. Virginia McSwain
We report on the discovery of a high velocity B star, HD 69686. We estimate its space velocity, distance, surface temperature, gravity, and age. With these data, we are able to rec…
Angular Diameters of the Hyades Giants Measured with the CHARA Array
Tabetha S. Boyajian, Harold A. McAlister, Justin R. Cantrell +8
We present angular diameters of the Hyades giants, gamma, delta^1, epsilon, and theta^1 Tau from interferometric measurements with the CHARA Array. Our errors in the limb-darkened…
Binary and Multiple O-Type Stars in the Cas OB6 Association
Todd C. Hillwig, Douglas R. Gies, William G. Bagnuolo +3
We present the results of time-resolved spectroscopy of 13 O-type stars in the Cas OB6 stellar association. We conducted a survey for radial velocity variability in search of binar…
Spectral Components of SS 433
D. R. Gies, M. V. McSwain, R. L. Riddle +3
We present results from new optical and UV spectroscopy of the unusual binary system SS 433, and we discuss the relationship of the particular spectral components we observe to the…