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GCVS Team
Ã??U 1809 +50. Lx(soft)/Lopt ~15. Emissions of H and KCaII, H, HeI, HeII, etc. In the spectrum. Epoch of Min I in V light is given. The period shows complex variations. The phase of Min I in U light is 0.30p, in B 0.15P, in R 0.05P. Min I is probably due to an eclipse of a hot spot and the gas flow near the surface of the white dwarf by the white dwarf itself. The depth of Min I is up to 0.7m. Min II with the depth up to 0.4m (sometimes absent), Min II - Min I = 0.55P. Min II coincides in phase with the X-ray eclipse. High and low states (b ~13.0m and B ~15.0m on average); in the high state there are variations with Delta(m) ~0.3m on the time scale >= 200d; the duration of low states is 130d - 700d [R.Hudec, L.Meinunger, MVS 7, H.8, 194, 1977.] or less. During low states the depth of minima is small. Flickering up to 0.8mV in several minutes or dozens of seconds; X-ray flickering on the time scale of ~10s not correlating with optical flickering. The magnetic field ~1*10**7 G at the equator, ~2*10**7 G on poles. Variable circular (from +3% to -9%) and linear (up to 7%) polarization. IR excess at lambda 10 mkm.
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