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13 papers · 1 filter
Gamma Cas Stars as Be + White Dwarf Binary Systems
Douglas Gies, Luqian Wang, Robert Klement
The origin of the bright and hard X-ray emission flux among the gamma Cas subgroup of B-emission line (Be) stars may be caused by gas accretion onto an orbiting white dwarf (WD) co…
The Orbits and Dynamical Masses of the Castor System
Guillermo Torres, Gail H. Schaefer, John D. Monnier +12
Castor is a system of six stars in which the two brighter objects, Castor A and B, revolve around each other every 450 yr and are both short-period spectroscopic binaries. Th…
Dynamical masses of the primary Be star and the secondary sdB star in the single-lined binary kappa Dra (B6 IIIe)
R. Klement, D. Baade, Th. Rivinius +16
Because many classical Be stars may owe their nature to mass and angular-momentum transfer in a close binary, the present masses, temperatures, and radii of their components are of…
Visual Orbits of Spectroscopic Binaries with the CHARA Array. IV. HD 61859, HD 89822, HD 109510, and HD 191692
Kathryn V. Lester, Gail H. Schaefer, Francis C. Fekel +18
We present the visual orbits of four spectroscopic binary stars, HD 61859, HD 89822, HD 109510, and HD 191692, using long baseline interferometry with the CHARA Array. We also obta…
The binary system of the spinning-top Be star Achernar
P. Kervella, S. Borgniet, A. Domiciano de Souza +16
Achernar, the closest and brightest classical Be star, presents rotational flattening, gravity darkening, occasional emission lines due to a gaseous disk, and an extended polar win…
The dust sublimation region of the Type 1 AGN NGC4151 at a hundred micro-arcsecond scale as resolved by the CHARA Array interferometer
Makoto Kishimoto, Matt Anderson, Theo ten Brummelaar +10
The nuclear region of Type 1 AGNs has only been partially resolved so far in the near-infrared (IR) where we expect to see the dust sublimation region and the nucleus directly with…