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astro-ph2007
Metallicity estimates of Galactic Cepheids based on Walraven photometry
S. Pedicelli, J. Lub, J. W. Pel +13
We present new empirical and theoretical calibrations of two photometric metallicity indices based on Walraven photometry. The empirical calibration relies on a sample of 48 Cephei…
astro-ph1997
Structure and Evolution of Nearby OB Associations
P. T. de Zeeuw, A. G. A. Brown, J. H. J. de Bruijne +4
We present the first results of a comprehensive census of the stellar content of the nearby OB associations based on Hipparcos positions, proper motions and parallaxes for 12842 ca…
astro-ph1997
New Results for Three Nearby OB Associations
R. Hoogerwerf, J. H. J. de Bruijne, A. G. A. Brown +3
We have developed a new procedure to identify moving groups, and have applied it to carry out a census of the nearby OB associations based on Hipparcos parallaxes and proper motion…