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| Paper: |
High Angular Resolution Observations of the Massive Stars in Cyg OB2 |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
366 |
| Authors: |
Caballero-Nieves, S. M.; Gies, D. R.; Nelan, E. P. |
| Abstract: |
It is a widely accepted fact that massive stars love company and have a significant affect on the evolution of the Universe, from galactic dynamics and structure to star formation. However, our knowledge of O-type multiple systems with periods in the range from years to thousands of years is incomplete. The Fine Guidance Sensors (FGS) on the Hubble Space Telescope and Adaptive Optics at the Gemini Observatory North are ideal for finding widely separated binaries at high angular resolution with separations of at least 0.″1. At a distance of 1.7 kpc, Cyg OB2 provides a nearby, young stellar environment, rich in high-mass stars. We observed 75 O- and early B-type stars and determined that 42% of the sample have at least one physical companion. We present these initial results as part of an ongoing survey of O stars with FGS. |
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