Abstract
AbstractWe observed the millisecond redback pulsar PSR J1023+0038 in its accreting regime on two nights in November 2017 on Russian 6‐m telescope with a high‐temporal resolution panoramic photometer‐polarimeter in a two‐channel (“blue” and “red”) setup. During 400 s (12% of nearly 3 hr of total observations), we detected coherent optical pulsations in both color bands with 1.69‐ms period, corresponding to the rotational period of neutron star known from the radio data, with amplitudes of 2.1% (“red”) and 1.3% (“blue”). Corresponding luminosity of pulsed component is about 1031 erg s−1 and may be caused by a synchrotron emission of electrons with moderate Lorentz factors close to a light cylinder during the interaction of accretion disk with ejected matter modulated with rotational period.
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