| 31. | The variable star V380 Orionis is embedded in NGC 1999.
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| 32. | It is mainly used in the observation of variable stars.
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| 33. | It has also been suspected of being a variable star.
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| 34. | His main work during this time was on variable stars.
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| 35. | It used the acronym ACYG for Alpha Cygni variable stars.
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| 36. | About two-thirds of all variable stars appear to be pulsating.
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| 37. | Rho Persei is a semiregular variable star of the evolution.
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| 38. | It is the prototype of the Beta Cephei variable stars.
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| 39. | Beta Doradus is a notably bright Cepheid variable star.
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| 40. | It was formally catalogued as variable star V1302 Aquilae,.
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