semiregular variables

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semiregular variables [¦sem·i′reg·yə·lər ′ver·ē·ə·bəlz]

(astronomy)

Variable red giant stars whose variation in brightness is repeated, but whose period and light curve may vary considerably from one cycle to the next; they have absolute magnitude of about 0 or -1 and quasi-periods of from about 40 to 150 days.

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