The discovery of periodic radio emission from the highly variable radio star LS I + 61 deg 303 is reported. On the basis of an analysis of 144 flux density measurements (August 1977 to March 1981), a period of 26.52 + or - 0.04 days is derived. Comparing the radio light curves at 5.0 and 10.5 GHz rules out occultation as an explanation of the periodic variation. The implications of the radio emission are discussed in the context of a binary model, which also explains the X-ray and possible gamma-ray emission associated with the source.
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Taylor et al. (1982) studied this question.