Astron. Astrophys. Suppl. Ser. 145, 223-228
A proper motion study of the globular cluster M 10
1,2,3,4 - M. Geffert
4 - J.J. Wang
1,2,3 - K. Reif
4 - J.M. Braun
Send offprint request: M. Geffert
1 - Shanghai Astronomical Observatory, Chinese Academy of Sciences,
Shanghai 200030, PR China
2 - National Astronomical Observatories, Chinese Academy of Sciences,
3 - Joint Lab for Optical Astronomy, Chinese Academy of Sciences,
Sternwarte der Universität Bonn, Auf dem Hügel 71,
D-53121 Bonn, Germany
Received September 17, 1999; accepted May 4, 2000
We present the first proper motion study of M 10 (NGC 6254).
Absolute proper motions of about 532 stars in the field of the globular cluster
M 10 were determined with respect to Hipparcos and ACT reference stars.
In addition to photographic plates of Bonn and Shanghai also wide field
CCD observations as second epoch plates were used.
The wide field CCD observations show an accuracy comparable to
that of the photographic plates.
A good coincidence of the solutions based on reference stars
from Hipparcos and from ACT was found.
Our final proper motions allow a sufficient separation
of cluster and field stars.
Two population II Cepheids were confirmed to be members of M 10.
The absolute proper motion of M 10 was determined and combined with
its distance from the Sun and its radial velocity.
The space motion and metallicity of M 10 indicates the characteristics of
a halo object with an orbit reaching to a maximal z
-distance of less
than 3 kpc.
Key words: astrometry --
globular clusters: individual: M 10 --
Galaxy: kinematics and dynamics
Copyright The European Southern Observatory (ESO)