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Bipolar Resistance Switching Characteristics of ZnO/Nb-Doped SrTiO3Heterojunctions
2009
Chinese Physics Letters
We report the detection of a faint stellar companion to the famous nearby A5V star Alcor (80 UMa). The companion has M-band (λ = 4.8 μm) magnitude 8.8 and projected separation 1. 11 (28 AU) from Alcor. The companion is most likely a low-mass (∼0.3 M ) active star which is responsible for Alcor's X-ray emission detected by ROSAT (L X 10 28.3 erg s −1 ). Alcor is a nuclear member of the Ursa Major star cluster (UMa; d 25 pc, age 0.5 Gyr), and has been occasionally mentioned as a possible distant
doi:10.1088/0256-307x/26/7/077303
fatcat:6v4t3r6xozfpnj2rbqeicngdva