Query= AM Her GCVS Query forms
  NNo      GCVS          J2000.0            Type      Max        Min I         Min II       Epoch        Year      Period          M-m/D     Spectrum      References  Other desig. p.m.(as/yr)   Epoch     Ident.     New type    GCVS
400066 |AM    Her *|181613.34 +495204.1 |AM/XRM+E  | 12.3    |  15.7      |(  0.4     )|V |43014.71266 |     |     0.128927       |     |pec+M4.5V        |09257 09256|           |             |1983.348| |GSC      |          |AM    Her |

AM    Her     = AN   1923.0028                |     
AM    Her     = GSC  3533.01105               |     
AM    Her     = X    18149+498                |     

      Reference to a chart or photograph:
09256. W.Liller, Sky and Tel 53, N5, 351, 1977.

Reference to a study of the star:

09257. P. Szkody, D.E.Brownlee, ApJ 212, L 113, 1977 {1977ApJ...212L.113S}


Remark: 3U 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.

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