Showing astro-phShow all
3 papers · 1 filter
astro-ph1999
Photometric and Kinematic Studies of Open Star Clusters I: NGC 581 (M 103)
Joerg Sanner, Michael Geffert, Jens Brunzendorf +1
We present CCD photometry and a proper motion study of the young open star cluster, NGC 581 (M 103). Fitting isochrones to the colour magnitude diagram, we found an age of 16 +/- 4…
astro-ph1997
Astrometry of the globular cluster 47 Tuc and possible optical identification of X-ray sources
M. Geffert, M. Auriere, L. Koch-Miramond
Positions of stars of 47 Tuc have been derived by the use of photographic plates and CCD frames (ESO La Silla) and data from the Hubble Space Telescope (HST). The positions have be…
astro-ph1997
Hot subdwarf stars - galactic orbits and distribution perpendicular to the plane
K. S. de Boer, Y. Aguilar Sanchez, M. Altmann +4
The spatial distribution and the population nature of subdwarf B type stars in the galaxy is investigated based on the kinematics of these stars. The orbits of 41 stars have been c…