Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194p...1m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 194, Jan. 1981, p. 1P-5P.
Astronomy and Astrophysics
Astronomy
134
Binary Stars, Early Stars, Radio Emission, Radio Stars, Stellar Models, X Ray Sources, Gamma Ray Astronomy, Neutron Stars, Pulsars, Stellar Radiation, Stellar Rotation
Scientific paper
The radio star LSI61 deg 303 is an unusual object possibly associated with the gamma-ray source CG 135. The recently observed radio periodicity of 26 days strongly suggests that the system is a binary. It is suggested that the invisible companion is a relatively young pulsar (of age 10,000-100,000 yr) losing energy via a relativistic wind. At the boundary between the pulsar wind and the stellar wind of the primary, the dominant energy-loss for relativistic electrons is Compton-scattering off the optical photons of the primary, which should account for the X-ray to gamma-ray emission, while synchrotron radiation from the same electrons would explain the radio emission. If the source radiates 10 to the 37th erg/s in the MeV band, as suggested by the observations by Perotti et al, a very high efficiency of production of 1-GeV electrons by the pulsar is required, which agrees with the expectations of some pulsar models. A substantial orbital eccentricity is expected.
Maraschi Laura
Treves Aldo
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