Physics – Optics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21913202c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #132.02
Physics
Optics
Scientific paper
Massive stars profoundly influence the evolution of the universe, from galactic dynamics and structure to star formation, and they are frequently found with bound companions. However, our knowledge of O-type multiple systems with periods in the range from years to thousands of years is incomplete because of their great distance. We present results from a high angular resolution survey to find such astrometric companions using the Fine Guidance Sensor (FGS) on the Hubble Space Telescope and using ground-based adaptive optics at Gemini North. We observed 75 O- and early B-type stars in Cyg OB2 and determined that 42% of the sample have at least one companion that meets a statistical criterion for gravitationally bound status. We also present initial FGS results of a larger sample of Galactic O-stars that include association, cluster, field and runaway stars for a more representative multiplicity fraction of massive stars.
This material is based upon work supported by the National Science Foundation under grant AST-1009080 and the Space Telescope Institute under grant HST-GO-10612.
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