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The Evolution of Galaxies on Cosmological Timescales

By J. E. Beckman, T. J. Mahoney, C. Jordi, X. Luri, E. Masana, J. Torra, F. Figueras, A. Domingo, A. E. Gómez and M. O. Mennessier


Abstract. The ESA HIPPARCOS satellite has provided astrometry of unprecedented accuracy, allowing to reassess, improve and refine the pre-HIPPARCOS luminosity calibrations. We review the ”classical ” absolute magnitude calibrations with the Strömgren-Crawford intermediate-band photometric system. A small zero point correction of about 2-4 % seems necessary, as well as to refine the dependences on metallicity and projected rotational velocity. The need of a rigorous statistical treatment of the extremely precise HIPPARCOS data to derive definite dependences of the luminosity on physical stellar parameters is emphasized. 1. The pre-HIPPARCOS luminosity calibrations The uvby − β photometric system is well suited to derive stellar physical parameters and in particular the luminosity, through calibrations accounting for the dependence on Teff and evolution. Further dependences on metallicity and projected rotational velocity were considered by several authors but the results were not conclusive enough. The most widely used calibrations are fully empirical (Crawford 1975, 1978

Year: 2000
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