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Title:
Three-dimensional Doppler Tomogram of Gas Flows in the Algol-Type Binary U Coronae Borealis
Authors:
Agafonov, Michail; Richards, Mercedes; Sharova, Olga
Affiliation:
AA(Radiophysical Research Institute (NIRFI), 25 Bolshaya Pecherskaya Street, Nizhny Novgorod 603950, Russia; ), AB(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802; ), AC(Radiophysical Research Institute (NIRFI), 25 Bolshaya Pecherskaya Street, Nizhny Novgorod 603950, Russia; )
Publication:
The Astrophysical Journal, Volume 652, Issue 2, pp. 1547-1553. (ApJ Homepage)
Publication Date:
12/2006
Origin:
UCP
ApJ Keywords:
Accretion, Accretion Disks, Stars: Binaries: Close, Stars: Binaries: Eclipsing, Stars: Individual: Constellation Name: U Coronae Borealis
DOI:
10.1086/508484
Bibliographic Code:
2006ApJ...652.1547A

Abstract

The reconstruction of three-dimensional (3D) Doppler tomograms based on observational data has been accomplished for the first time. The distribution of the Hα emission intensity I(Vx,Vy,Vz) of the interacting Algol binary system U Coronae Borealis has been restored in 3D velocity space with resolutions of 30 km s-1 in Vx and Vy and 110 km s-1 in Vz. The reconstruction was based on 47 Hα spectra from 1994 by applying the developed radioastronomical approach (RA) to few-projections tomography. The comparison between the previous 2D and our 3D Doppler tomograms shows similarities with the main structural features of the gas flows in the orbital plane. Specifically, the gas stream along the ballistic trajectory and equatorial emission centered on the primary star are displayed on the 3D Doppler tomogram as distinct emission sources. A high-velocity stream (Vz~200 km s-1) with strong emission intensity has also been discovered moving in the direction across the orbital plane of the system.
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