Discovery of a 26.5-day optical periodicity of LSI+61 deg 303

Details Discovery of a 26.5-day optical periodicity of LSI+61 deg 303 Discovery of a 26.5-day optical periodicity of LSI+61 deg 303

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.239..733m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 239, Aug. 1, 1989, p. 733-740. Research supported by th

Astronomy and Astrophysics

Astronomy

35

Periodic Variations, Radio Astronomy, Radio Stars, X Ray Binaries, Accretion Disks, Astronomical Photometry, Early Stars, Light Curve, Neutron Stars, Synchrotron Radiation

Scientific paper

Observations obtained between December 1984 and February 1987 reveal an optical periodic modulation of the highly variable radio binary star LSI+61 deg 303. The modulation has a period of about 26.5 d, an amplitude of about 0.05 mag, and includes 'high' and 'low' states. The optical period and light curve are found to be similar to those observed in the radio regime. The binary is modeled under the assumption that the excess luminosity of the 'high' state is produced by some periodic mechanism. Two mechanisms for the 'high' state are considered, synchrotron radiation and the heating of the inner part of the accretion disk around a compact object.

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