| 11. | In the MK system, a luminosity class is added to the spectral class using Roman numerals.
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| 12. | The luminosity class cannot be determined clearly, although it has been suggested to be a supergiant.
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| 13. | The MK classification assigned each star a spectral type based on the Harvard classification and a luminosity class.
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| 14. | Classification is complex and difficult with small differences between luminosity classes and a continuous range of intermediate forms.
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| 15. | It is a dwarf ( luminosity class V ) red ( spectral class M1 ) variable by rotation.
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| 16. | The supergiant luminosity classes are due to very low surface gravities on pulsating low-mass and rarefied stars.
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| 17. | With a stellar classification of G8 IV, the luminosity class of IV indicates this is a subgiant star.
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| 18. | The luminosity class sub-type Vz is defined uniquely for O stars, specifically types O3 to O8.
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| 19. | It forms a pair with a star of type B9 with an unknown luminosity class separated by 0.28 arcseconds.
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| 20. | This star has a stellar classification of G5, making it a G-type star with an undetermined luminosity class.
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