Bibcode
Lennon, D. J.; Drew, J. E.; Wright, N. J.; Herrero, A.; Berlanas, S. R.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 484, Issue 2, p.1838-1842
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4
2019
Citations
45
Refereed citations
38
Description
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.
Related projects
Physical properties and evolution of Massive Stars
This project aims at the searching, observation and analysis of massive stars in nearby galaxies to provide a solid empirical ground to understand their physical properties as a function of those key parameters that gobern their evolution (i.e. mass, spin, metallicity, mass loss, and binary interaction). Massive stars are central objects to
Sergio
Simón Díaz