Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...19111008g&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #110.08; Bulletin of the American Astronomical Society, Vol. 29, p.1388
Astronomy and Astrophysics
Astronomy
Scientific paper
The luminous early-type binary LSI+61 303 is an interesting radio, X-ray and possible gamma-ray source. At radio wavelengths it exhibits periodic outbursts with an approximate period of 26.5 days as well as a longer term modulation of the outburst peaks of approximately 4 years. Recently Paredes et al. have found evidence that the X-ray outbursts are very likely to recur with the same radio outburst period from an analysis of RXTE all sky monitoring data. The system has been observed by many groups at all wavelengths but still the energy source powering the radio outbursts and their relation to the high energy emission remains a mystery. For more details see the "LSI+61 303 Resource Page" at http://www.srl.caltech.edu/personnel/paulr/lsi.html . There has been increasing evidence for a change in the period of the system. We will present a new ephemeris for the system based on a Bayesian analysis of 20 years of radio observations including the GBI-NASA radio monitoring data.
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