Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.4112w&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #41.12; Bulletin of the American Astronomical Society, Vol. 32, p.1462
Astronomy and Astrophysics
Astronomy
Scientific paper
The globular cluster NGC 6934 is an ideal cluster to use in the search for co-moving field stars that might represent a tidal tail or even a stellar stream in the halo. NGC 6934 has been shown in a recent paper (Dinescu et al. 1999) to be a retrograde globular cluster, which shares orbital parameters, with NGC 7089. It also has a very large line-of-sight velocity (/ -400 km/s) which is almost 2 sigma from the mean of the halo in this direction. Because of this, any field stars found in the near spatial vicinity of NGC 6934 and with the same line-of-sight velocity are very likely to be members of a co-moving population. As a first step in a program to identify such a population I will present photometry results for a large sample of field stars near NGC 6934. The data presented will be from several fields in the outer regions of the cluster and several more from fields 5 - 7 degrees from the cluster center. The cluster data is used to set fiducial lines for identifying population candidates from the large number of contaminating disk stars. I will also present results for a fainter sample using the Digitized Sky Survey fields, calibrated with the observed stars from this program. Also included will be a C-M diagram of the outer regions of NGC 6934 and a list of newly identified variable stars.
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