Tidal Interaction in High Mass X-ray Binaries

Abstract

Our aim is to investigate tidal interaction in High-Mass X-ray Binary stars in order to determine in which objects the rotation of the mass donors is synchronized or pseudosynchronized with the orbital motion of the compact companion. We calculate the pseudosynchronization period (P_ps) and compare it with the rotational period of the mass donors (P_rot). We find that (1) the Be/X-ray binaries are not synchronized, the mass donors rotate faster than the orbital period and the ratio P_ps/P_rot is 2-300; (2) the giant and supergiant systems are close to synchronization and for them the ratio P_ps/P_rot is 0.3-2.

6 pages, 1 figure, Accepted for publication in Astronomical Notes (AN)

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• Orbital parameters of the high-mass X-ray binary 4U 2206+54
• Comprehensive UV and Optical spectral analysis of Cygnus X-1: Stellar and wind parameters, abundances, and evolutionary implications
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