| 21. | He published multiple papers on stellar absolute magnitudes, proper motions, and spectroscopic binaries.
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| 22. | It is a spectroscopic binary, whose components are separated by 0.176 arcseconds.
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| 23. | S Monocerotis A is a spectroscopic binary system with an orbital period of 74 years.
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| 24. | 89 Her is a spectroscopic binary system with the pair surrounded by a dusty disc.
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| 25. | It is suspected of itself being a spectroscopic binary with the companion being much fainter.
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| 26. | The inner pair form a spectroscopic binary with an orbital period of around 10 years.
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| 27. | Castor also has a faint and widely separated companion, which is also a spectroscopic binary.
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| 28. | "' 12 Bo�tis "'is a spectroscopic binary in the constellation Bo�tes.
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| 29. | It is a spectroscopic binary system.
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| 30. | "' V373 Cas "'is a spectroscopic binary in the constellation Cassiopeia.
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