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Absolute Magnitude Determinations from Hydrogen-Line Photometry

Published online by Cambridge University Press:  07 February 2017

D. L. Crawford
D. L. Crawford*
Affiliation:
Kitt Peak National Observatory*, U.S.A.

Abstract

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The history and status of Balmer hydrogen-line photometry are briefly reviewed, and problems associated with calibrations in general are commented on.

The calibration work at Kitt Peak is described in some detail for B, A, and F type stars. The data used, the determination of intrinsic colours and colour excesses, photometric classification, and the relation of our indices to other people's are reviewed. With this background, the procedure used in establishing the absolute magnitude — Hβ calibration is given, and the preliminary calibration is presented. Finally, the work remaining to be done before the calibration is final is noted, and a comparison is given to Blaauw's zero-age main sequence calibration.

Type
Part IV: Absolute Magnitude Determinations from Hydrogen-Line Photometry
Information
Symposium - International Astronomical Union , Volume 54: Problems of Calibration of Absolute Magnitudes and Temperature of Stars , 1973 , pp. 93 - 113
Copyright
Copyright © Reidel 1973 

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