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In symbiotic binaries, jets and disk winds may be integral to the physics ofaccretion onto white dwarfs from cool giants. The persistent outflow fromsymbiotic star MWC 560 (=V694 Mon) is known to manifest as broad absorptionlines (BALs), most prominently at the Balmer transitions. We report thedetection of high-ionization BALs from C IV, Si IV, N V, and He II inInternational Ultraviolet Explorer spectra obtained on 1990 April 29-30, whenan optical outburst temporarily erased the obscuring 'iron curtain' ofabsorption troughs from Fe II and similar ions. The C IV and Si IV BALs reachedmaximum radial velocities at least 1000 km/s higher than contemporaneous Mg IIand He II BALs; the same behaviors occur in the winds of quasars andcataclysmic variables. An iron curtain lifts to unveil high-ionization BALsduring the P Cygni phase observed in some novae, suggesting by analogy atemporary switch in MWC 560 from persistent outflow to discrete mass ejection.At least three more symbiotic stars exhibit broad absorption with blue edgesfaster than 1500 km/s; high-ionization BALs have been reported in AS 304(=V4018 Sgr), while transient Balmer BALs have been reported in Z And and CHCyg. These BAL-producing fast outflows can have wider opening angles than hasbeen previously supposed. BAL symbiotics are short-timescale laboratories fortheir giga-scale analogs, broad absorption line quasars (BALQSOs), whichdisplay a similarly wide range of ionization states in their winds.

Broad absorption line symbiotic stars: highly ionized species in the fast outflow from MWC 560