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A CCD imaging search for wide metal-poor binaries
Astronomy and Astrophysics
We explored the regions within a radius of 25 arcsec around 473 nearby, low-metallicity G- to M-type stars using (VR)I optical filters and small-aperture telescopes. About 10% of the sample was searched up to angular separations of 90 arcsec. We applied photometric and astrometric techniques to detect true physical companions to the targets. The great majority of the sample stars was drawn from the Carney-Latham surveys; their metallicities range from roughly solar to [Fe/H]=-3.5 dex. Ourdoi:10.1051/0004-6361:20035907 fatcat:oy4mb5llorfjhkqioxw2jbonb4