[AAVSO LightCurve, 1yr] [AAVSO LightCurve, 5yr]

GCVS data:
Epoch 2000: ra = 274.056, dec = 49.868
Variability type: AM/XRM+E
Spectral type: pec+M4.5V

GCVS remarks:
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 [09258] 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.

Search (AM-HER): Google Scirus AAVSO
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Relevant links:

Chart status: ERROR

Observations on this site:
2453262 0.0 0.0

2453237 0.0 0.0

2453236 0.0 0.0

2452840 0.0 0.0

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