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

BB Dor was observed during its low state 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 Halpha, HeI and Na-D, as well as TiO absorption troughs trace the motion of the irradiated secondary star. We detect two additional components in the Halpha 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.

preprint2012arXivOpen access
L. SchmidtobreickP. Rodriguez-GilK. S. LongB. T. GaensickeC. TappertM. A. P. Torres
astro-ph.SR
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L. SchmidtobreickP. Rodriguez-GilK. S. LongB. T. GaensickeC. TappertM. A. P. Torres

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