SIMBAD references

1954ApJ...120..506M - Astrophys. J., 120, 506-508 (1954)

Spectral classification with exceedingly low dispersion.

MORGAN W.W., MEINEL A.B. and JOHNSON H.M.

Journal keyword(s):

Nomenclature: Fig. 5: Schulte NNA (Nos 13-19) = [MM53] Cyg OB2 NNA (Nos 13-19) added.

Simbad objects: 32

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