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... > Stellar astronomy > Stellar types > Stellar evolutionary types > Evolved stars > Giant stars > Late-type giant stars > Semi-regular variable stars
Stellar astronomy > Stellar types > Late-type stars > Late-type giant stars > Semi-regular variable stars
... > Stellar astronomy > Stellar types > Variable stars > Intrinsic variable stars > Pulsating variable stars > Long period variable stars > Semi-regular variable stars
... > Stellar astronomy > Stellar types > Variable stars > Periodic variable stars > Long period variable stars > Semi-regular variable stars

Preferred term

Semi-regular variable stars  

Definition

  • A type of giant or supergiant pulsating variable star, with intermediate or late spectra, showing noticeable periodicity in its light changes, accompanied or sometimes interrupted by various irregularities. Periods lie in the range from 20 to more than 2000 days, while the shapes of the light curve may be rather different and variable with each cycle. The amplitudes may be from several hundredths to several magnitudes (usually 1-2 magnitudes in the V filter). Examples are Betelgeuse, Antares, and Rasalgethi. Semiregular variables are classified in several subtypes: SRA, SRB, SRC, and SRD. (en)

Broader concept

Narrower concepts

Entry terms

  • Semiregular variable stars (en)

Contributor

Editorial note

Example

  • Betelgeuse (en)

URI

http://astrothesaurus.org/uat/1444

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