Bayesian Periodic Signal Detection. II. Discovery of Periodic Phase Modulation in LS I +61 deg303 Radio Outbursts

Details Bayesian Periodic Signal Detection. II. Discovery of Periodic Phase Modulation in LS I +61 deg303 Radio Outbursts Bayesian Periodic Signal Detection. II. Discovery of Periodic Phase Modulation in LS I +61 deg303 Radio Outbursts

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...520..376g&link_type=abstract

The Astrophysical Journal, Volume 520, Issue 1, pp. 376-390.

Astronomy and Astrophysics

Astronomy

26

Methods: Statistical, Radio Continuum: Stars, Stars: Individual: Alphanumeric: Ls I +61 Deg303, X-Rays: Stars

Scientific paper

A Bayesian analysis of the phase variations of the 26.5 day periodic radio outbursts from the high-mass X-ray binary LS I +61 deg303 demonstrates a clear periodic modulation on a timescale 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^+14_-11 days as well as a more accurate outburst period of 26.4917+/-0.0025 days. From the shape of the phase and outburst 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 Be star primary. The phase modulation also suggests a rather sudden onset to each new cycle of mass loss by the Be star. The next maximum in long-term flux modulation is predicted to occur between 1999 February and 2000 March (JD 2,451,233-2,451,633).

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