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A Comparison of Luminosity Calibrations for MK Classifications of OB Stars

Published online by Cambridge University Press:  12 April 2016

Janet Rountree Lesh
Janet Rountree Lesh*
Affiliation:
Laboratory for Astronomy and Solar Physics, NASA

Extract

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It has been apparent for some time that there is a need for a single luminosity calibration to be used with modern MK types for early-type stars, at least from 0 through middle B. The widely used calibration of Blaauw (1963) has to be replaced because the refinement of the MK system - as reflected in the large collections of spectral types by Lesh (1968), Hiltner, Garrison, and Schild (1969) and Walborn (1971) - has led to a lower mean luminosity for most main sequence subgroups of early-type stars, as the higher luminosity stars tend to move out of class V. Thus the calibrations of Lesh (1968) and Walborn (1972, 1973) are systematically fainter than Blaauw’s

Type
II Criteria and Applications of MK Classification
Information
International Astronomical Union Colloquium , Volume 47: Spectral Classification of the Future , 1979 , pp. 81 - 86
Copyright
Copyright © Vatican Observatory 1979

References

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