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New radio pulsar discovered in binary system

Astronomers have discovered a new radio pulsar in a binary system with a massive companion star using the Canadian Hydrogen Intensity Mapping Experiment (CHIME). About the opening reported in the research preprint on the arXiv server.

The pulsar received the designation PSR J2108+4516. Observations of the object were carried out almost daily for almost three years from October 20, 2018 to September 3, 2021. The rotation period is about 0.58 seconds, and the orbital period is 269 days. The orbital eccentricity was found to be at about 0.09, and the characteristic age of the pulsar was estimated to be about 2.1 million years. The surface magnetic field of PSR J2108+4516 was about 1.2 trillion Gauss.

The mass of the companion object ranges from 11.7 to 113 solar masses. This bright blue-white star EM* UHA 138 is located at a distance of about 10,600 light-years from Earth.

According to the authors of the article, PSR J2108+4516 can serve as a natural laboratory for studying massive stellar winds and circumstellar disks. It is expected that in the future, spectroscopic observations of this pulsar will be carried out to determine the type of companion and find out if it has a disk, as well as X-ray and gamma-ray studies to study the interaction of the disk and wind.

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