Variable Star AMHer


CROSS IDENTIFICATION: AM Her

AM Her = AN 1923.0028 


GCVS result

ID: 400066
Variable star: AM Her
RA 2000: 181613.3
DE 2000: +495204
RA 1950:
DE 1950:
Type of variability: AM/XRM+E
Max (mag): 12.3
Min (mag): 15.7
Photometric system: V
Epoch (JD): 43014.71266
Period (d): 0.128927
Year of outburst for N, SN:
M-m (or D):
Spectrum: pec+M4.5V
Study reference: 09257
Chart or phot. ref.: 09256
Cases of non-existence:


GCVS NOTE result

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 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 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.

GCVS NOTES fulltext search:  


NSV: Suspected Variable NSV  not found.


BRKA result

Variable star: AM Her
Brightness type: H14
Points: 10
RA 2000: 181613.7
DE 2000: +495156
Max (mag): 12.3
Min (mag): 15.7
Sec (mag):
Photometric system: V
Epoch (JD): 43014.71266
Period (d): 0.128927
D (hour):
d (hour):
Astrophysical note:
Reference: GCVSe2001
Finding chart: X

MEKA: Variable star AM Her not found.


Please put the variable's designation into field in common style - for example: ZUMa, zuma, V477Cyg, v1182Cyg, NSV 255, nsv2544. Designation of bright variable stars like Beta Persei type in short style (three letters) - bet Per. The complete cross-identification among more then 30 catalogues will be done after submitting.
Spaces and cases are ingnored..


 
Search for variable star:
Search in: All catalogues / databases
 
 
 Search for data on the NET
(AFOEV, B.R.N.O., MEDUZA, VSOLJ, VSNET, HPHK, AICU-Ondrejov)
 Open European Journal on Variable stars

 
 GCVS (2011)  43.675 records
 NSV (1997) 14.811 records
 BRKA (2001)  1.432 records
 MEKA (2001)  147 records
 CzeV, SvkV and RafV catalogues (new variables)
 
 BCVS (1994)  529.953 records
 
 Show DSS plate 15'x 15' (use coords: )
(Selected catalogue has to be checked above.)