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Ultraluminous X-Ray Sources
Fabrika, S. N.; Atapin, K. E.; Vinokurov, A. S. +1 more
Ultraluminous X-ray sources (ULXs) were identified as a separate class of objects in 2000 based on data from the Chandra X-Ray Observatory. These are unique objects: their X-ray luminosities exceed the Eddington limit for a typical stellar-mass black hole. For a long time, the nature of ULXs remained unclear. However, the gradual accumulation of d…
Magnetic Fields of CP Stars in the Orion OB1 Association. V. Stars of Subgroups (c) and (d)
Romanyuk, I. I.; Semenko, E. A.; Moiseeva, A. V. +2 more
—The paper presents the results of magnetic field measurements of 27 chemically peculiar stars in subgroups (c) and (d) of the Orion OB1 association. In total, more than 140 circularly polarized spectra were obtained and measured in the period from 2013 to 2020. An analysis of the results showed that 13 out of 24 CP stars in subgroup (c) have a ma…
Precise Masses, Ages, and Orbital Parameters of the Binary Systems HIP 11352, HIP 70973, and HIP 72479
Al-Wardat, M. A.; Al-Tawalbeh, Y. M.; Hussein, A. M. +7 more
In this work, the orbital elements are improved and the total masses of the three close visual binary systems CVBSs: HIP 11352, HIP 70973, and HIP 72479 are precisely calculated. The calculations were performed based on an assessment of the latest Gaia DR2 and Hipparcos trigonometric parallax measurements. The morphology and kinematics of orbits a…
On the Motion of Multiple Stars in the Pleiades Based on Gaia DR2
Danilov, V. M.
We estimated a number of parameters for small groups of stars in the open Pleiades star cluster using Gaia DR2 coordinate and proper motion data for stars in the region of radius d = 2.5° relative to the center of the cluster on the celestial sphere. We selected 36 wide pairs of stars with magnitudes mG < 15m and velocitie…