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The proper-motion signal of unresolved binaries in the Hipparcos catalogue

Brosche, P.; Odenkirchen, M.

We present an investigation of the differences between quasi-instantaneous stellar proper motions from the Hipparcos catalogue and long-term proper motions determined by combining Hipparcos and the Astrographic Catalogue. Our study is based on a sample of about 12000 stars of visual magnitude from 7 to 10 in two declination zones on the northern a…

Pleiades luminosity function: fine structure and new Pre-MS models

Piskunov, A. E.; Schilbach, E.; Belikov, A. N.

In order to study a model-dependence of the results achieved in the previous investigations of the Pleiades luminosity function using D'Antona and Mazzitelli (1994) evolutionary tracks, we repeated the computations with the new track system by D'Antona and Mazzitelli (1997). T h e following main conclusions can be drawn: the new models agree bette…