| 21. | It has a spectral class of F81bv, meaning that it is an F-type supergiant star.
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| 22. | This is a hot, core hydrogen-fusing B-type main sequence star of spectral class B2 Vp.
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| 23. | The red supergiant is in the constellation Carina and has a spectral class of M3.
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| 24. | It belongs to the spectral class L5; its surface temperature is 1300 to 2000 Kelvin.
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| 25. | The luminosity is also lower than predicted by models for a star of this spectral class.
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| 26. | The secondary star has an O5 spectral class.
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| 27. | No massive star remains with spectral class O for more than about 5 6 million years.
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| 28. | In 1933, Bengt Str�mgren introduced the term Hertzsprung Russell diagram to denote a luminosity-spectral class diagram.
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| 29. | The brightest member of this constellation is Aldebaran, an orange-hued, spectral class K5 III giant star.
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| 30. | In the MK system, a luminosity class is added to the spectral class using Roman numerals.
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