Bibcode
Lauchner, A.; Wilhelm, R.; Beers, T. C.; Allende Prieto, C.
Referencia bibliográfica
American Astronomical Society Meeting 203, #112.26; Bulletin of the American Astronomical Society, Vol. 35, p.1388
Fecha de publicación:
12
2003
Número de citas
0
Número de citas referidas
0
Descripción
Recent star count surveys of areas around globular star clusters have
shown strong evidence of tidal tails stretching out many degrees beyond
the cluster tidal radius. These tails are believed to be cluster stars
which have escaped due to tidal shocking after passages through the disk
of the Galaxy. Although the statistical star counts indicate and
overdensity of stars around the clusters, to date, there is little
kinematic verification for any tidal tail stars.
We present results of a kinematic search for evidence of tidal tails
using the Sloan Digital Sky Survey (SDSS), Data Release-1 (DR1). This
search was conducted using thirteen globular star clusters which were
found to be within three degrees of the DR1 strips. Using stars from the
DR1 spectroscopy database, we have determined radial velocities,
distances and metal abundance for the large number of the SDSS stars.
The SDSS stars include horizontal branch stars, blue stragglers and main
sequence turn-off stars, most of which reach to the distances of the
clusters. Comparing these parameters to that of a given globular
cluster, we search for stars which match the cluster parameters to
within the uncertainty of our derived parameters. Along with the
candidate findings for this project, we will also including a comparison
of candidate tidal star positions to that of published tidal tails from
star counts, and discuss future refinements and follow-up observations.