Observational evidence of variations in the accretion rate in the HZ Hercules/Hercules X-1 system

Details Observational evidence of variations in the accretion rate in the HZ Hercules/Hercules X-1 system Observational evidence of variations in the accretion rate in the HZ Hercules/Hercules X-1 system

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pazh...14..992b&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 14, Nov. 1988, p. 992-1005. In Russian. In Russian. In Russian.

Physics

5

Accretion Disks, Neutron Stars, Pulsars, Stellar Physics, Variable Stars, X Ray Binaries, Blue Stars, Interstellar Gas, Stellar Color, Stellar Coronas

Scientific paper

The light variations of HZ Her in filter U and colour U-B during the optical eclipse reach 0m.3 on months and years timescales. Long-time variations of the U-B colours correlate with X-ray "turn on" moments, i.e., with the current value of the 35 day cycle period and with P1.24 period of the X-ray pulsar. The variations may be related to cold (6000 - 7000K) gas collected near the side of the optical component opposite to the neutron star when gas is moving away from the corona around the accretion disk outer ring.

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