| 21. | Vega is also a variable star that varies slightly in brightness.
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| 22. | Pulsating variable stars typically pulsate in only one of these modes.
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| 23. | His research included variable stars and the measurement of radial velocities.
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| 24. | M2 contains about 150, 000 stars, including 21 known variable stars.
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| 25. | Gamma Doradus is the prototype of the Gamma Doradus variable stars.
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| 26. | It was given the variable star designation NS Puppis in 1975.
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| 27. | SS Virginis is a variable star with a noticeable red color.
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| 28. | It is a suspected variable star with a very small amplitude.
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| 29. | T Indi is the only bright variable star in Indus.
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| 30. | Alpha Muscae appears to be a Beta Cephei variable star.
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