Coherent ultraviolet radiation from accreting neutron stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Coherent Radiation, Magnetic Stars, Neutron Stars, Stellar Mass Accretion, Ultraviolet Radiation, Cyclotron Frequency, Emission Spectra, Gyromagnetism, Pulsars, Stellar Luminosity, Ultraviolet Astronomy, X Ray Sources

Scientific paper

Amplified gyromagnetic radiation at the proton cyclotron frequency is predicted for accreting, strongly magnetized neutron stars. This mechanism is restricted to low luminosity sources with a relatively cool emission region. Neutron stars accreting at 10 to the -13th solar masses per yr fulfill these conditions, and should be continuously observable in the UV band. X-ray pulsars are borderline cases which may or may not emit coherently. Typically a few percent of the accretion luminosity is radiated at frequencies close to the proton gyrofrequency in a coherently emitting source.

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