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Non-thermal emission in Cyg OB2

Published online by Cambridge University Press:  31 March 2017

D. Fenech ,
J. Morford  and
R. Prinja
D. Fenech
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT email: dmf@star.ucl.ac.uk
J. Morford
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT email: dmf@star.ucl.ac.uk
R. Prinja
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT email: dmf@star.ucl.ac.uk
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Abstract

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We report here on the first results from the Cyg OB2 Radio Survey (COBRaS), which is a UCL-led e-MERLIN legacy project to provide a deep-field radio mapping of the Cygnus OB2 association. The project has been awarded a total allocation of 252 hours at C-band (5 GHz) and 42 hours at L-band (1.6 GHz) to image the core of the cluster.

We discuss in particular the presence of non-thermal radio emission at 20 cm (L-band), and its potential as a highly efficient way to identify binaries via single-epoch observations, particularly for colliding-wind binaries. COBRaS data will provide a powerful tool for establishing binary incidence in Cyg OB2, specifically in the difficult intermediate-period range (1–100 yr).

Ultimately, we aim to assemble a substantial and uniquely sensitive radio dataset, which will be exploited to address several fundamentally important areas of stellar astrophysics, including mass-loss, binary frequency, stellar cluster dynamics, and triggered star-formation.

Keywords

radiation mechanisms: nonthermalbinaries: generalstars: early-typeassociations: individual: Cyg OB2
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 139 - 140
Copyright
Copyright © International Astronomical Union 2017 

References

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