Optical observations of the X-ray source 2S0921-630

Details Optical observations of the X-ray source 2S0921-630 Optical observations of the X-ray source 2S0921-630

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..279b&link_type=abstract

(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie

Astronomy and Astrophysics

Astronomy

7

Binary Stars, Optical Emission Spectroscopy, Stellar Models, Stellar Spectra, Stellar Spectrophotometry, X Ray Sources, Correlation Coefficients, Light (Visible Radiation), Light Curve, Periodic Variations, Radiant Flux Density, Red Shift, Stellar Mass Accretion, Ubv Spectra

Scientific paper

Photometric observations are reported of the optical counterpart of the X-ray source 2S0921-630. The data, obtained at the South African Astronomical Observatory during three weeks in 1980 and 1981, are consistent with a 17.9 day periodic modulation of the flux in the B band. Correlated variability of the (B-V) and (U-B) color indices with the B mag is demonstrated and quantified. The observed B mag and colors at maximum and minimum light are used to compute some of the system parameters. A model of 2S0921-630 is proposed in terms of a binary system in which the variable inclination of a luminous accretion disk produces the long-term modulation of the optical flux.

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