| 41. | Astronomers have identified three spectral classes in which a significant set of blue galaxy cluster members may be categorized.
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| 42. | The temperatures for WR spectral classes are less precisely defined, especially for the SMC and especially for the hottest classes.
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| 43. | Although it shares its spectrum with a spectral class T brown dwarf, Delorme speculates that it may be a planet.
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| 44. | A WO spectral class was eventually assigned, with relatively weak O emission but confirmed by the lack of C emission.
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| 45. | Alpha Cygni ( ? Cyg ) variables are nonradially pulsating supergiants of spectral classes B ep to A ep Ia.
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| 46. | Brown dwarfs of spectral class Y are cooler than those of spectral class T and have qualitatively different spectra from them.
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| 47. | The closest star to Earth in the constellation is Gliese 318, a white dwarf of spectral class DA5 and magnitude 11.85.
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| 48. | Brown dwarfs of spectral class Y are cooler than those of spectral class T and have qualitatively different spectra from them.
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| 49. | Eta Sagittae is a star of spectral class K2 III with a magnitude of 5.1, which belongs to the Hyades Stream.
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| 50. | Spectroscopic studies have shown that the family members span a noticeable range of compositions, although all remain within the S spectral class.
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