Luminosity calibration for OB stars from Hipparcos trigonometric parallaxes

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Hipparcos trigonometric parallaxes and observational data for open clusters are used to determine the absolute magnitudes M V of O and B stars of various spectral subtypes and luminosity classes, including those with broadened lines and hydrogen emission lines. The same data are used to derive a relation between M V and the index β of the Strömgren photometric system. The resulting calibrations and the spectroscopic-parallax method are used to determine the distances to young open clusters.

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