Luminosity calibration for OB stars from Hipparcos trigonometric parallaxes |
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Authors: | A V Loktin G V Beshenov |
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Institution: | (1) Astronomical Observatory, Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russia |
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Abstract: | 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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