8 papers · 1 filter
The evolution of the Milky Way monitored in the solar neighbourhood
B. Fuchs, C. Dettbarn, H. Jahreiss +1
In this review we concentrate on the dynamical evolution of the Milky Way as monitored in the solar neighbourhood. The relevant data sets are presented and discussed in detail. In…
A Finding List for Delta_mu Binaries derived from a Comparison of HIPPARCOS Proper Motions with Long-term Averaged Data
Roland Wielen, Christian Dettbarn, Hartmut Jahreiss +3
The comparison of quasi-instantaneously measured HIPPARCOS proper motions with long-term averaged proper motions, derived from ground-based data, allows the identification of many…
Polaris: astrometric orbit, position, and proper motion
R. Wielen, H. Jahreiss, C. Dettbarn +2
We derive the astrometric orbit of the photo-center of the close pair alpha UMi AP (=alpha UMi Aa) of the Polaris multiple stellar system. The orbit is based on the spectroscopic o…
Indications on the binary nature of individual stars derived from a comparison of their HIPPARCOS proper motions with ground-based data I. Basic principles
R. Wielen, C. Dettbarn, H. Jahreiss +2
We present a method which provides some information on the possible binary nature on an appararently single star. The method compares the instantaneously measured HIPPARCOS proper…
A Comparison of ground-based Cepheid P-L Relations with HIPPARCOS Parallaxes
H. Baumgardt, C. Dettbarn, B. Fuchs +2
The statistical test described by Wielen et al.(1994) is used to derive new zero-points of ground-based Cepheid period-luminosity (PL) and period-luminosity-colour (PLC) relations.…
The combination of ground-based astrometric compilation catalogues with the HIPPARCOS Catalogue I. Single-star mode
R. Wielen, H. Lenhardt, H. Schwan +1
The combination of ground-based astrometric compilation catalogues, such as the FK5 or the GC, with the results of the ESA Astrometric Satellite HIPPARCOS produces for many thousan…