Discovery of Halpha satellite emission in a low state of the SW Sextantis star BB Doradus
L. Schmidtobreick, P. Rodriguez-Gil, K. S. Long, B. T. Gaensicke, C., Tappert, and M. A. P. Torres
TL;DR
This paper reports the first detection of Halpha satellite emission lines in the low state of the SW Sextantis star BB Doradus, revealing new spectral features and insights into the system's components.
Contribution
It presents the discovery of satellite emission lines in an SW Sex star, expanding understanding of spectral features in low states of cataclysmic variables.
Findings
Detection of Halpha satellite emission lines in BB Doradus
Satellite lines share characteristics with those in magnetic CVs
No accretion signatures observed during low state
Abstract
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.
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