| 11. | It is an irregular variable, its apparent magnitude varying between 2.37 and 2.45.
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| 12. | "' PU Aurigae "'is an irregular variable star located in the constellation Auriga.
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| 13. | The extrinsic S stars are less luminous and longer-lived, often smaller-amplitude irregular variables.
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| 14. | It is also an irregular variable star with a range of less than a tenth of a magnitude.
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| 15. | Aldebaran is a slightly variable star, of the slow irregular variable type " LB ".
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| 16. | U Antliae is a red irregular variable star that varies between magnitudes 5.27 and 6.04.
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| 17. | It is catalogued as an irregular variable star, but a number of possible pulsation periods have been detected.
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| 18. | At the time they were simply described as irregular variables, although remarkable for being the brightest stars in those galaxies.
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| 19. | It is an irregular variable and has an apparent visual magnitude which varies between 3.36 and 3.44.
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| 20. | 13 Bo�tis is a irregular variable star and its brightness varies from magnitude + 5.2 to + 5.3.
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