The 39-d period in Cyg X - 1

Details The 39-d period in Cyg X - 1 The 39-d period in Cyg X - 1

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.270..229w&link_type=abstract

Nature, Volume 270, Issue 5634, pp. 229-230 (1977).

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Scientific paper

KEMP et al.1,2 recently claimed to have discovered a 39-d period in the linear polarisation of the U band light for HDE 226868, the optical counterpart of Cygnus X - 1. Within the errors their period is exactly seven times the 5.60-d orbital period of this binary system. Based on this result Milgrom and Shaham3 produced a model for Cyg X - 1 involving a three-body system in which the third component is in a 39-d orbit about the 5.6-d X-ray binary system. This note draws attention to the absence of a 39-d period in other data on this star.

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