Coordinated X-ray and optical observations of Scorpius X-1

Details Coordinated X-ray and optical observations of Scorpius X-1 Coordinated X-ray and optical observations of Scorpius X-1

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..177a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 1, p. 177-182.

Astronomy and Astrophysics

Astronomy

22

Stellar Spectrophotometry, Visual Observation, X Ray Astronomy, X Ray Binaries, Accretion Disks, Color-Color Diagram, Ginga Satellite, Light Curve

Scientific paper

We present the results of coordinated, partly simultaneous, optical and X-ray (Ginga) observations of the low-mass X-ray binary Sco X-1. We find that the division between the optically bright and faint state, at a blue magnitude B = 12.8, corresponds to the change from the normal to the flaring branch in the X-ray color-color diagram as proposed by Priedhorsky et al. (1986). From archival Walraven data we find that in both optical states the orbital light curve is approximately sinusoidal, and have a similar amplitudes.

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