Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...575..427g&link_type=abstract
The Astrophysical Journal, Volume 575, Issue 1, pp. 427-434.
Astronomy and Astrophysics
Astronomy
105
Methods: Data Analysis, Radio Continuum: Stars, Stars: Emission-Line, Be, X-Rays: Binaries
Scientific paper
The binary star LS I +61°303 is remarkable for its periodic radio outbursts every 26.5 days. We recently discovered a ~4.4 yr periodic modulation of the phase and amplitude of these outbursts using the Gregory-Loredo Bayesian algorithm for detecting periodic signals of unknown shape. In this paper we obtain improved estimates of both the orbital period P1 and the modulation period P2 based on a larger data set and examine the behavior of the spectral index between 2.2 and 8.3 GHz versus the modulation period. The new estimates are P1=26.4960+/-0.0028 and P2=1667+/-8 days, and our best estimate of the radio phase of periastron is ~0.4. Analysis of the spectral index data indicates that the optical depth in the synchrotron emission region is always <<1 at 8.3 GHz and can reach values of ~2.7 at 2.2 GHz. A test of the precessing Be star model of Lipunov & Nazin indicates that it is unlikely to be the correct mechanism to explain the 1667 day periodic modulation.
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