Search for orbital X-ray variation in Scorpius X-1

Details Search for orbital X-ray variation in Scorpius X-1 Search for orbital X-ray variation in Scorpius X-1

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..743p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 743-747. DOE-sponsored research.

Astronomy and Astrophysics

Astrophysics

9

Eclipsing Binary Stars, Periodic Variations, Spectrum Analysis, Stellar Orbits, X Ray Binaries, Ariel 5 Satellite, Emission Spectra, Light Curve, Line Spectra, Visible Spectrum

Scientific paper

All 5 yr of 3-6 keV monitoring of Sco X-1 by the Ariel 5 all-sky monitor have been reanalyzed to search more sensitively for variation at the 0.787313 d orbital period. The best limits on orbital variations come from data selected to exclude active episodes. Any narrow absorption dip has an average depth less than 1.0 percent (0.1/Delta Phi), where Delta Phi is the width in units of the orbital period (2 sigma confidence level). A weak (0.4 percent) sinusoidal modulation, with 3.2 sigma significance, reaching minimum at phase 0.59 + or - 0.06 with respect to superior conjunction of the optical emission-line source is observed. In any case, the upper limit to a sinusoidal orbital modulation is 0.7 percent. Sco X-1 never - at least not for more than 2 hrs - dipped below its normal quiescent level.

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