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

作者：Schmidtobreick L^*; Rodriguez Gil P; Long K S; Gaensicke B T; Tappert C; Torres M A P

来源：Monthly Notices of the Royal Astronomical Society, 2012, 422(1): 731-737.

DOI：10.1111/j.1365-2966.2012.20653.x

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

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 H alpha, 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 H alpha emission line that share many characteristics of similar %26apos;satellite%26apos; 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.

• 出版日期2012-5