An Etymological Dictionary of Astronomy and Astrophysics

A variable → supergiant star with typical periods of the order of 10 to 100 days and amplitudes less than a few tenths of a magnitude. PVSGs are thought to be pulsating → g modes, caused by a density inversion, arising from an → opacity bump, most likely from Fe, H, and/or He.

See also: → periodical; → -ly; → variable; → supergiant.