A binary star in which mass is transferred from one star to the other.
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A mass-transfer binary is a type of binary star system where one star transfers mass onto its companion due to their close proximity. This transfer of mass can occur through processes such as stellar winds or Roche-lobe overflow. The mass transfer affects the evolution and properties of both stars in the system.
Because the barycenter of the Pluto-Charon lies between the two bodies, it is a binary system, and one could extrapolate the definition of a dwarf Planet to include Charon. However, the IAU has not yet defined a binary dwarf planet. So the answer is yes and no. If you were to adhere to the current IAU opinion, Charon is a moon. If you would like to adhere to the physics of the system, then yes, they are binary.
Binary
The binary name for KBr is Potassium Bromide.
Two stars orbiting each other are "binary stars" ...a group of stars near each other, may be formally or informally known as a "cluster".
c) mitosis and binary fission