A HIGH ANGULAR RESOLUTION SURVEY OF MASSIVE STARS IN CYGNUS OB2: RESULTS FROM THE HUBBLE SPACE TELESCOPE FINE GUIDANCE SENSORS
@article{CaballeroNieves2013AHA,
title={A HIGH ANGULAR RESOLUTION SURVEY OF MASSIVE STARS IN CYGNUS OB2: RESULTS FROM THE HUBBLE SPACE TELESCOPE FINE GUIDANCE SENSORS},
author={Saida M. Caballero-Nieves and Edmund P. Nelan and Douglas R. Gies and D. J. Wallace and Kathleen DeGioia-Eastwood and Artemio Herrero and Wei Chun Jao and Brian D. Mason and Philip Massey and Anthony F. J. Moffat and Nolan R. Walborn},
journal={The Astronomical Journal},
year={2013},
volume={147},
pages={40}
}We present results of a high angular resolution survey of massive OB stars in the Cygnus OB2 association that we conducted with the fine guidance sensor 1R (FGS1r) on the Hubble Space Telescope. FGS1r is able to resolve binary systems with a magnitude difference ΔV 60%. One of the new discoveries is a companion to the hypergiant star MT 304 = Cyg OB2-12, and future measurements of orbital motion should provide mass estimates for this very luminous star.
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