Journal Article

Ultraviolet study of the active interacting binary star R Arae using archival <i>IUE</i> data

Phillip A. Reed, George E. McCluskey, Yoji Kondo, Jorge Sahade, Edward F. Guinan, Alvaro Giménez, Daniel B. Caton, Daniel E. Reichart, Kevin M. Ivarsen and Melissa C. Nysewander

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 2, pages 913-923
Published in print January 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI:
Ultraviolet study of the active interacting binary star R Arae using archival IUE data

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The eclipsing and strongly interacting binary star system R Arae (HD 149730) is in a very active and very short-lived stage of its evolution. R Ara consists of a B9V primary and an unknown secondary. We have collected the International Ultraviolet Explorer (IUE) archival data on R Ara, with most of the data being studied for the first time. There are 117 high-resolution IUE spectra taken in 1980, 1982, 1985, 1989 and 1991. We provide photometric and spectroscopic evidence for mass transfer and propose a geometry for the accretion structure. We use colour-scale radial velocity plots to view the complicated behaviour of the blended absorption features and to distinguish the motions of hotter and cooler regions within the system. We observed a primary eclipse of R Ara in 2008 and have verified that its period is increasing. A model of the system and its evolutionary status is presented.

Keywords: accretion, accretion discs; techniques: spectroscopic; binaries: close; circumstellar matter; stars: evolution; ultraviolet: stars

Journal Article.  5897 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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