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Revisiting the absolute-magnitude calibration of F-type supergiants and bright giants as a function of the equivalent width of the OIλ7774Å triplet

Published online by Cambridge University Press:  26 February 2013

A. K. Dambis
A. K. Dambis*
Affiliation:
Sternberg Astronomical Institute, M. V. Lomonosov Moscow State University, Universitetskii pr. 13, Moscow, 119992Russia email: mirage@sai.msu.ru
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Abstract

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We reduce the published measurements of the equivalent width of the oxygen triplet (Oiλ7774Å) to a single system and combine the resulting homogenized indices with revised Hipparcos parallaxes to derive the MK versus log[W(Oiλ7774Å)] absolute-magnitude calibration for bright F-type giants and supergiants and use the resulting calibration to estimate both the distance to the Large Magellanic Cloud and the parameters of the Galactic rotation curve.

Keywords

stars: distancesstars: luminositiessupergiantsstars: kinematics

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