Connections between X-ray and optical variability in the low mass X-ray binary 1735-444

Details Connections between X-ray and optical variability in the low mass X-ray binary 1735-444 Connections between X-ray and optical variability in the low mass X-ray binary 1735-444

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..533c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 1, 1989, p. 533-547.

Astronomy and Astrophysics

Astronomy

9

Stellar Mass, Stellar Spectra, Variable Stars, X Ray Binaries, Black Body Radiation, Variability, X Ray Spectra, X Ray Spectroscopy

Scientific paper

The results of a long duration (4 day) simultaneous optical and X-ray observation of the low mass X-ray binary 1735-444 are presented. The observed X-ray and optical fluxes are correlated; the strength of this correlation is increased when allowance is made for the relatively large orbital modulation of the optical light. A simple interpretation of the optical radiation as reprocessed X-rays in a blackbody disk leads to an implausibly low disk temperature if the disk is assumed to have constant geometry. 1735-444 exhibits bimodal behavior having an X-ray spectral hardness ratio versus source intensity which is similar to that previously seen in sources such as Cyg X-2.

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