Raman O VI spectroscopy of accretion and bipolar outflow in Sanduleak's star

Sanduleak's star is a suspected symbiotic binary in the Large Magellanic Cloud, which has a powerful jet extending over 15 pc. We investigate two broad bands at 6825 and 7082 in Sanduleak's star. These bands are the results of Raman-scattering of O VI 1032 and 1038 photons by atomic hydrogen and only observed in symbiotic stars. From the high-resolution spectrum obtained with Magellan Inamori Kyocera Echelle (MIKE) at the Magellan-Clay telescope we note that the profiles of the two bands look quite different: while the 6825 band shows a single broad profile, the 7082 band exhibits a distinct triple-peak profile. In our analysis we propose that the O VI emission region can be decomposed into a blue, red and central emission parts of an accretion disk, a bipolar outflow and an optically thick, compact component surrounding the white dwarf.