line profile variability (LPV)
vartandegi-ye farâpâl-e xatt
Fr.: variabilité du profil de raie
Fr.: variabilité spectrale
The state of a spectrum from an astronomical object in which the lines change with time as far as their intensity, profile, and wavelength are concerned.
The quality, state, or degree of being variable or changeable.
Quality noun from → variable.
Fr.: indice de variabilité
A measure of variability of a star (such as Welch-Stetson variability index) which combines the information from two passbands assuming that changes in the star's luminosity occur nearly simultaneously at all optical wavelengths.