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        Disentangling the spatial substructure of Cygnus OB2 from Gaia DR2

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        Author
        Berlanas, S. R.
        Wright, N.
        Herrero, A.
        Drew, J. E.
        Lennon, D. J.
        Attention
        2299/21297
        Abstract
        For the first time, we have explored the spatial substructure of the Cygnus OB2 association using parallaxes from the recent second Gaia data release. We find significant line-of-sight substructure within the association, which we quantify using a parametrized model that reproduces the observed parallax distribution. This inference approach is necessary due to the non-linearity of the parallax distance transformation and the asymmetry of the resulting probability distribution. Using a Markov Chain Monte Carlo ensemble sampler and an unbinned maximum likelihood test, we identify two different stellar groups superposed on the association. We find the main Cygnus OB2 group at ∼1760 pc, further away than recent estimates have envisaged, and a foreground group at ∼1350 pc. We also calculate individual membership probabilities and identify outliers as possible non-members of the association.
        Publication date
        2019-04-01
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stz117
        Other links
        http://hdl.handle.net/2299/21297
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