Journal Article

Discovery of Hα satellite emission in a low state of the SW Sextantis star BB Doradus*

L. Schmidtobreick, P. Rodríguez-Gil, K. S. Long, B. T. Gänsicke, C. Tappert and M. A. P. Torres

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 1, pages 731-737
Published in print May 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20653.x
Discovery of Hα satellite emission in a low state of the SW Sextantis star BB Doradus*

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BB Dor was observed during its low state in 2009. Signatures of both binary components are revealed in the average optical spectrum; no signature of accretion is observed. Narrow emission lines of Hα, He i and Na D, as well as TiO absorption troughs, trace the motion of the irradiated secondary star. We detect two additional components in the Hα emission line that share many characteristics of similar ‘satellite’ lines observed in the low state of magnetic cataclysmic variables of AM Her type. It is the first time such emission components are detected for an SW Sex star.

Keywords: accretion, accretion discs; magnetic fields; stars: activity; stars: individual: BB Dor; novae, cataclysmic variables; stars: winds, outflows

Journal Article.  5167 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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