Fr.: étoile binaire
→ binary; → star.
close binary star
setâre-ye dorin-e kip
Fr.: étoile binaire serrée
A binary system in which the separation of the component stars is comparable to their diameters, so that they influence each other's evolution most commonly by the tidal forces.
compact binary star system
râžmân-e dorin-e hampak
Fr.: système binaire compact
A binary star system which is composed of a collapsed object
(→ degenerate dwarf, → neutron star,
or → black hole) in orbit with a low-mass (≤ 0.5 Msol)
secondary star, wherein the collapsed star → accretes
matter from its → companion.
These two objects form a binary system of overall dimensions
106 km with an orbital period of only hours or less.
→ X-ray binary.