Variable Star HZHer


HZ Her = AN 1936.0142 

GCVS result

ID: 400226
Variable star: HZ Her
RA 2000: 165749.8
DE 2000: +352033
RA 1950:
DE 1950:
Type of variability: XPR+E
Max (mag): 12.8
Min (mag): 15.2
Photometric system: B
Epoch (JD): 41397.584
Period (d): 1.700175
Year of outburst for N, SN:
M-m (or D):
Spectrum: B0Ve-F5e
Study reference: 09282
Chart or phot. ref.: 09283
Cases of non-existence:

GCVS NOTE result

Her X-1 = 4U 1656 + 35. Lx/Lopt = 2 - 60. The Table gives elements for light minima due to eclipsing variability and the reflection effect. Min I coincides with the X-ray eclipse. Shallow Min II may be present. The reflection effect causes variations with Delta(m) up to 1.5m. A cycle of 34.875d duration is "observed in X-ray band two thirds of the cycle. The optical light curve changes are observed during the 35d cycle [09283]. According to [06539], during JD2427543 - 657 and JD2428630 - 29789 the "strong reflection effect was absent varying with P = 1.7d and had Delta(m) ~0.5m, Min I = Min II. In [06546] it is stated that such intervals with no reflection effect, of 8d to 7a duration, took place for almost half the time since 1890. The light changes during such intervals are in the range 14.7m - 15.2m pg. Since 1957 intervals without the reflection effect were not observed. In June - July 1983 the predicted phases of high X-ray flux did not take place, but the reflection effect did not disappear [09284]. Secondary light variations: P1 = 1.0977d (delta(B1) = 0.33m), P2 = 0.871173d*E (delta(B2) = 0.10m), P3 = 1.623846d*E (delta(B3) = 0.17m) [09285]. X-ray pulsar, P = 1.2377991s (JD2443357), dP/dt/P = (-2.9 +- 0.2)*10**(-6)/yr [09286], sometimes noticeable also in the optical range [06543]. Rapid brightness flickering.

GCVS NOTES fulltext search:  

NSV: Suspected Variable NSV  not found.

BRKA result

Variable star: HZ Her
Brightness type: H14
Points: 10
RA 2000: 165750.0
DE 2000: +352034
Max (mag): 12.8
Min (mag): 15.2
Sec (mag):
Photometric system: B
Epoch (JD): 41397.584
Period (d): 1.700175
D (hour):
d (hour):
Astrophysical note:
Reference: GCVSe2001
Finding chart: X

MEKA result

Variable star: HZ Her
Type of variability:
Points: 5
Max (mag):
Min (mag):
Photometric system:
Period (d):
Finding chart: ID: 103, M III

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.
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 GCVS (2011)  43.675 records
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