Discovery of Periodic Phase Modulation in LSI+61 303 Radio Outbursts

Details Discovery of Periodic Phase Modulation in LSI+61 303 Radio Outbursts Discovery of Periodic Phase Modulation in LSI+61 303 Radio Outbursts

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4313g&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #43.13; Bulletin of the American Astronomical Society, Vol. 30, p.1315

Astronomy and Astrophysics

Astronomy

Scientific paper

A Bayesian analysis of the phase variations of the 26.5 day periodic radio outbursts from the high mass X-ray binary LSI+61(0) 303 demonstrates a clear periodic modulation on a time scale similar to that previously found for the long term modulation of the outburst peak flux density. Combining the outburst phase and flux information we obtain a phase and flux modulation period of 1584_{-11}(+14) days as well as a more accurate outburst period of 26.4917 +/- .0025 days. From the shape of the phase and outbursts flux modulation we find that larger outbursts occur at an earlier orbital phase, closer to periastron, probably as a result of variations in the wind from the rapidly rotating B star primary. The next maximum in long term flux modulation is predicted to occur between February, 1999 and March, 2000 (Julian day 2,451,233 to 2,451,633).

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