Has a 97 minute periodicity in 4U 1700-37/HD 153919 really been discovered

Details Has a 97 minute periodicity in 4U 1700-37/HD 153919 really been discovered Has a 97 minute periodicity in 4U 1700-37/HD 153919 really been discovered

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228l..75h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 228, Mar. 1, 1979, p. L75-L78. Research supported by the Nederlandse

Astronomy and Astrophysics

Astrophysics

18

Eclipsing Binary Stars, Periodic Variations, Stellar Luminosity, X Ray Stars, Computerized Simulation, Early Stars, Fourier Analysis, Light Curve, Neutron Stars, Signal Analysis

Scientific paper

The identification of a 97-minute modulation in the X-ray and optical intensities of 4U 1700-37/HD 153919 with an intrinsic periodicity of the source is subject, at present, to important uncertainties. A computer simulation is used to show the dominance of a spurious modulation with a similar period in a Fourier analysis of a smooth signal of about 0.6 days variability (simulating the mean X-ray curve), viewed through the 94.5- and 101-minute and the 'telemetry dropout' SAS 3 windows. An analysis of a full night of optical observations of HD 153919 around binary phase 0.5 also fails to show any such modulation.

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