DISCOVERY OF A FAINT COMPANION TO ALCOR USING MMT/AO 5 μm IMAGING ∗

@article{Mamajek2010DISCOVERYOA,
  title={DISCOVERY OF A FAINT COMPANION TO ALCOR USING MMT/AO 5 μm IMAGING ∗},
  author={E. Mamajek and M. Kenworthy and P. Hinz and Michael R. Meyer University of Rochester and S. Observatory and U. Arizona and Institute for Astronomy and E. zurich},
  journal={The Astronomical Journal},
  year={2010},
  volume={139},
  pages={919-925}
}
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 (LX � 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… Expand
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References

SHOWING 1-10 OF 56 REFERENCES
Thermal infrared constraint to a planetary companion of vega with the MMT adaptive optics system
THE X-RAY EMISSION OF A-TYPE STARS
A catalogue of multiplicity among bright stellar systems
Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
...
1
2
3
4
5
...