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		| Paper: | 
		Is there an absolute magnitude calibration for O-type stars? | 
	 
	
		| Volume: | 
		7, Properties of Hot Luminous Stars: Boulder-Munich Workshop | 
	 
	
		| Page: | 
		16 | 
	 
	
		| Authors: | 
		Garmany, Catharine D. | 
	 
	
	
		| Abstract: | 
		In order to make a meaningful comparison between the absolute magnitude calibration for O stars in the Milky Way and the Magellanic Clouds, a reexamination has begun of the sources of data for this calibration of Galactic O stars. The large mean error in the Galactic O star absolute magnitude calibration is of considerable concern. From a preliminary study of the earliest O stars, it appears that this error is not due to the inclusion of poor quality data. A comparison among Galactic and Magellanic Cloud data sets is presented. | 
	 
	
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