Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244.1001m&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 15, 1981, p. 1001-1021. Research supported by the Miller Institute for Basic Rese
Astronomy and Astrophysics
Astrophysics
111
Binary Stars, Pulsars, Stellar Radiation, Stellar Spectrophotometry, X Ray Sources, Fourier Transformation, Heao 1, Orbital Elements, Power Spectra, Stellar Motions
Scientific paper
The binary period of 4U 1626-67 was found from an analysis of its optical pulsations. A single lower frequency sideband of the 2.4% amplitude 7.68-s optical pulsations from this X-ray pulsar was detected on at least three different nights in Fourier transforms of high-speed photometry obtained with the CTIO 4 m telescope. The 0.42% sidelobe pulsations have a frequency which is 0.4011(2) mHz lower than the frequency of the direct pulsations near 130.26 mHz. The weaker sidelobe pulsations are interpreted as arising from X-ray to optical reprocessing on the companion star and are shifted to the lower frequency by the rotation frequency of the binary orbit because the X-ray pulsar spins in the same sense as the orbital motion (direct or prograde).
Mason Keith O.
Middleditch John
Nelson Jerry E.
White Nicholas E.
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