Chinese astronomers discovered a new pulsar in a ball cluster of NGC 6712, which is a “black widow”, that is, has a stellar companion with an extremely low mass that pulls the interstellar substance. This is reported in the article published in the preprints of the ARXIV.
Radiopulsar PSR J1853-0842A (J1853) is located in rich metals with a ball cluster NGC 6712 at a distance of 22,500 light years from the ground. This object has a period of rotation of about 2.15 milliseconds, that is, it refers to millisecond pulsars. It is assumed that such celestial bodies are formed in double systems, when a more massive component turns into a neutron star and begins to devour a substance from his companion, speeding up its rotation.
The class of extreme double pulsars with semi-degenerate companion stars was called “Pulsary-spiders”. These space objects are classified either as “black widows” if the mass of the star is less than 0.1 mass of the Sun, or as “Krasnikinniki” if the star is harder. In this case, the satellite in J1853 has an estimated mass of 0.018 to 0.036 mass of the Sun. Turnover occurs in 3.56 hours, while the eclipse of the pulsar occurs.
according to calculations, the pulsar slows the speed of rotation by about 0.00239 attosecans (10 per minus 18th second) per second. The resulting value of the deceleration rate of rotation confirms the belonging of the NGC 6712 to this millisecond pulsar of the Black Widow type.