O9IVn ~

Temperature						Luminosity
Type	Class	Value	Temperature	Details		Type	Class	Details		Pecularities	Quality
Harvard	O	9	33000 K	Harvard spectral value is 9 with class Harvard spectral class O with effective temperature [30000, 60000] ; absorptions [N, C, He, O]		Yerkes	IV	Yerkes spectral luminosity with class IV: subgiant		n	~

COBREX simplification = O9 ~

Temperature
Type	Class	Value	Temperature	Details		Quality
Harvard	O	9	33000 K	Harvard spectral value is 9 with class Harvard spectral class O with effective temperature [30000, 60000] ; absorptions [N, C, He, O]		~

Ref: An Encoding System to Represent Stellar Spectral Classes in Archival Databases and Catalogs Version 1.4