Wide binaries among halo subdwarfs.
The authors present results of a search for wide companions to halo subdwarfs of known metallicity. They have taken CCD I-band frames in order to detect faint stars at angular separations of 1″- 30″from the subdwarfs. The target sample includes over 1000 stars, and about 50% have already been observed. For a small subset of this sample (about 50
Martín, E. L. et al.
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1995