First detection of the mass donor in the prototype interacting binary W Serpentis gives a mass ratio of 0.36 +/- 0.09 and masses of 2.0 and 5.7 solar masses, with evidence for an L3 outflow into a circumbinary disk.
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A Spectroscopic and Interferometric Study of W Serpentis Stars. I. Circumbinary Outflow in the Interacting Binary W Serpentis
First detection of the mass donor in the prototype interacting binary W Serpentis gives a mass ratio of 0.36 +/- 0.09 and masses of 2.0 and 5.7 solar masses, with evidence for an L3 outflow into a circumbinary disk.