Four-year modulation of periodic radio outbursts from LSI + 61 deg 303

Details Four-year modulation of periodic radio outbursts from LSI + 61 deg 303 Four-year modulation of periodic radio outbursts from LSI + 61 deg 303

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...339.1054g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 339, April 15, 1989, p. 1054-1058. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

53

B Stars, Ephemeris Time, Radio Stars, Stellar Activity, Variable Stars, X Ray Binaries, Airglow, Least Squares Method, Signal To Noise Ratios

Scientific paper

New 6 cm observations of the binary radio, X-ray, and gamma-ray star LSI + 61 deg 303 obtained in August 1984 and September 1986 are presented. The data accumulated to date provide evidence for a strong modulation in the amplitude of the 26.496 day periodic radio outbursts. The modulation occurs on a time scale of 4 yr. Two possible explanations are considered: (1) variable beaming from a precessing relativistic jet and (2) variable accretion due to quasi-cyclic Be star envelope variations.

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