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

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...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2012-05, Vol.422 (1), p.731-737
Main Authors: Schmidtobreick, L., Rodríguez-Gil, P., Long, K. S., Gänsicke, B. T., Tappert, C., Torres, M. A. P.
Format: Article
Language:English
Subjects:
accretion, accretion discs
magnetic fields
novae, cataclysmic variables
stars: activity
stars: individual: BB Dor
stars: winds, outflows
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Summary: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.
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2012.20653.x