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
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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 |
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_______________Cross-identifications:_______________
AM Her = AN 1923.0028 |
AM Her = GSC 03533.01105 |
AM Her = X 18149+498 |
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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}
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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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