SIMBAD references

2019MNRAS.484.1838B - Mon. Not. R. Astron. Soc., 484, 1838-1842 (2019/April-1)

Disentangling the spatial substructure of Cygnus OB2 from Gaia DR2.

BERLANAS S.R., WRIGHT N.J., HERRERO A., DREW J.E. and LENNON D.J.

Abstract (from CDS):

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.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): astrometry - parallaxes - stars: distances - stars: early-type - stars: massive - open clusters and associations: individual: Cygnus OB2

Status in Simbad:  waiting for electronic table

Simbad objects: 11

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2019.12.15-21:44:35

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