Zobrazeno 1 - 10
of 108
pro vyhledávání: '"Wielen, R."'
We present an analysis of the space motions of 742 subdwarf stars based on the sample of Carney et al. (1994, CLLA). Hipparcos parallaxes, TYC2+HIP proper motions and Tycho2 proper motions were combined with radial velocities and metallicities from C
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501212
Mean proper motions and parallaxes of 205 open clusters were determined from their member stars found in the Hipparcos Catalogue. 360 clusters were searched for possible members, excluding nearby clusters with distances D < 200 pc. Members were selec
Externí odkaz:
http://arxiv.org/abs/astro-ph/0010306
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 the second part we review various mechanisms, which drive the dynamica
Externí odkaz:
http://arxiv.org/abs/astro-ph/0009059
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 thousands of stars proper motions which are significantly more accurate than
Externí odkaz:
http://arxiv.org/abs/astro-ph/0007262
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 orbit of the Cepheid alpha UMi A (orbital period of AP: 29.59 years), a
Externí odkaz:
http://arxiv.org/abs/astro-ph/0002406
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 motion with the long-term averaged, ground-based proper motion or with
Externí odkaz:
http://arxiv.org/abs/astro-ph/9901228
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 thousands of stars proper motions which are significantly more accurate than
Externí odkaz:
http://arxiv.org/abs/astro-ph/9812472
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. Eleven relations are compared with the Hipparcos data. Our results ar
Externí odkaz:
http://arxiv.org/abs/astro-ph/9812437
Publikováno v:
Astrophys.Space Sci. 265 (1999) 175-178
A sample of subdwarfs with accurate space velocities and standarized metallicities is presented. This was constructed by combining Hipparcos parallaxes ond proper motions with radial velocities and metallicities from Carney et al. (1994; CLLA). The a
Externí odkaz:
http://arxiv.org/abs/astro-ph/9811442
The Sixth Catalogue of Fundamental Stars (FK6) combines the ground-based astrometric data of the basic fundamental stars, obtained over more than two centuries and summarized in the FK5, with the observations of the HIPPARCOS astrometry satellite. Th
Externí odkaz:
http://arxiv.org/abs/astro-ph/9807301