Evidence for a 39-d period in CYG X-1

Details Evidence for a 39-d period in CYG X-1 Evidence for a 39-d period in CYG X-1

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270..227k&link_type=abstract

Nature, vol. 270, Nov. 17, 1977, p. 227, 228

Astronomy and Astrophysics

Astronomy

15

Cygnus Constellation, Periodic Variations, X Ray Sources, Polarization Characteristics, Power Spectra, Ultraviolet Astronomy, Ultraviolet Filters

Scientific paper

Results are reported for long-term (over 225 nights) monitoring of the ultraviolet-filter polarization of Cyg X-1. Power spectra of this polarization are presented which suggest a peak at the approximate period of 39 days. Statistical aspects of the apparent 39.2-day periodicity are summarized, and it is concluded that this periodicity is real with a probability exceeding 97%. It is noted that the 39.2-day period is very likely to be the exact seventh multiple of the binary period of Cyg X-1 (5.60 days).

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