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ИСТИНА ФИЦ ПХФ и МХ РАН |
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We reduce the published measurements of the equivalent width of the oxygen triplet (Olambda7774A) to a single system and combine the resulting homogenized indices with revised Hipparcos parallaxes to derive theMK versus log[W(Olambda7774°A)] 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.