UU Herculis star
A semiregular variable, somewhat Cepheid-like in its behavior, but that pulsates with two different periods (see double-mode variable) and has occasional standstills. One theory suggests that UU Herculis stars are relatively low-mass post-asymptotic giant branch stars in a stage of evolution in which their spectra mimic those of more massive supergiants.
Related entry• variable stars
Related category• TYPES OF STAR
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