An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

The apparent shift of the wavelength towards the shorter wavelength region of the radiation spectrum of an approaching object due to the Doppler effect.

→ blue; → shift.

A constituent of a composite astronomical object which has a motion directed towards the observer, as revealed by its spectrum.

→ blueshift; → component.

A high-luminosity variable star, which represents a transition phase in the life of a massive star when it evolves off the main sequence to become a supernova. Only about a dozen confirmed LBVs are presently known in our Galaxy. → Hubble-Sandage variable.

→ luminous; → blue; → variable.